I. Executive Summary: The Structural Shift of the 2025 Threat Landscape
The Open Worldwide Application Security Project (OWASP) Top 10: 2025 Release Candidate (RC1) represents a significant evolutionary step, formalizing the industry’s shift away from focusing solely on isolated coding errors toward addressing systemic, architectural, and operational failures that define modern application risk.1 While the OWASP Top 10 serves primarily as an awareness document, not a complete standard, it highlights the most critical risks that development and security teams must prioritize.1 For organizations seeking rigorous verification and maturity models beyond this list, OWASP recommends comprehensive frameworks such as the Application Security Verification Standard (ASVS), the Software Assurance Maturity Model (SAMM), and the DevSecOps Maturity Model (DSOMM).1
The 2025 edition introduces two entirely new categories and executes one major consolidation, demonstrating a clear focus on risks amplified by interconnectedness and complexity.1 Specifically, A03: Software Supply Chain Failures expands the scope of previous dependency concerns, and A10: Mishandling of Exceptional Conditions introduces crucial attention to error handling and resilience. Perhaps the most profound philosophical change is the consolidation of Server-Side Request Forgery (SSRF) into A01: Broken Access Control.1 This grouping emphasizes that while SSRF involves input manipulation, the fundamental security failure is the unauthorized access and bypass of internal authorization boundaries, classifying the risk by its ultimate impact rather than its mechanism of delivery.3 This overall refocus confirms that modern risks are now predominantly driven by configurations, external dependencies, and failure modes across the entire software development lifecycle.1
II. The Unyielding Dominance of Foundational Risk (A01 and A02)
The 2025 list strongly reinforces the critical nature of foundational security controls, evidenced by Broken Access Control and Security Misconfiguration retaining or ascending to the top positions. These categories represent architectural failures that security professionals consistently encounter in real-world testing.
II.A. A01: Broken Access Control (BAC): The Apex Predator
Broken Access Control (BAC) retains its position at No. 1, reaffirming its status as the most serious application security risk.1 This persistence is overwhelmingly supported by quantitative evidence gathered during the data collection cycle. The contributed data indicates that 100% of the applications tested were found to have some form of broken access control.4 This pervasive presence underscores the difficulty developers face in consistently implementing authorization logic across complex applications.
The sheer scale of the problem is reflected in the metrics. A01:2025 maps to 40 distinct Common Weakness Enumerations (CWEs)—the highest number of any category—and accounts for the largest volume of detected instances, totaling 1,839,701 occurrences in the contributed data.4 Furthermore, A01 maintains high severity metrics, with an average weighted exploitability score of 7.04 and an average weighted impact score of 3.84, confirming that when BAC is present, it is often severe and easy to exploit.5 Common attack vectors include unauthorized information disclosure, modification of data, horizontal or vertical privilege elevation, and exploiting insecure direct object references (IDORs).4
Critical Metrics for A01:2025 Broken Access Control
II.B. A02: Security Misconfiguration: Rising Complexity and Scope
Security Misconfiguration (A02:2025) experienced a notable climb, moving up three positions from No. 5 in the 2021 list to No. 2 in the 2025 list.5 This rapid ascension is statistically justified by a substantial volume of reported vulnerabilities, with an average incidence rate of 3.00% and 719,084 total occurrences of related CWEs mapped across 16 different weaknesses.5
The prevalence of this risk category is strongly correlated with the ongoing evolution of software architecture. Modern systems, built upon microservices, cloud infrastructure, and complex API gateways, increasingly rely on external configuration files, environment settings, and Infrastructure as Code (IaC) templates to define their behavior and security posture.5 The analysis suggests that the rise is not surprising, given the steady increase in highly configurable software.5
This high-ranking position highlights a critical interdependence between Misconfiguration and Access Control failures. For example, an overly permissive Identity and Access Management (IAM) role defined within a cloud-native IaC template constitutes a Misconfiguration (A02). If an attacker compromises a weakly secured service using this role, they gain unauthorized access to data stores or internal APIs, which is fundamentally a Broken Access Control failure (A01). Therefore, addressing the architectural flaws introduced through misconfigured IaC, enforcing the Principle of Least Privilege (PoLP), and continuously monitoring for configuration drift are essential steps toward mitigating the risks in both the No. 1 and No. 2 categories.7
Key Quantitative Data Supporting A02:2025 Security Misconfiguration
III. Structural Reclassification: Contextualizing SSRF and Injection
The 2025 list features two key changes regarding specific vulnerability types: the consolidation of Server-Side Request Forgery and the decline in the ranking of Injection vulnerabilities. Both adjustments reflect a maturity in how the security community models risk, focusing on underlying causes and contemporary defenses.
III.A. Server-Side Request Forgery (SSRF) Consolidation into A01
Server-Side Request Forgery (SSRF), which was A10 in the 2021 list, has been merged entirely into A01:2025 - Broken Access Control.1 This decision repositions SSRF (CWE-918) as a subclass of access failure.4
The rationale for this consolidation stems from the core threat model of SSRF. An attacker leverages an SSRF flaw to compel the server to make unauthorized requests to resources that should be inaccessible to the attacker, such as internal APIs, backend services, or cloud metadata endpoints.3 The successful exploitation depends entirely on the server failing to enforce an explicit authorization boundary—a violation of the principle of least privilege—when making the internal request.10 By classifying SSRF under A01, OWASP shifts the defensive focus from simply fixing input validation to implementing consistent authorization policies and strong network segmentation to prevent internal lateral movement.10 This categorization strongly advocates for treating SSRF as an authorization bypass mechanism that exposes the application’s internal environment, a critical failure in access control architecture.
III.B. A05: Injection: Decline Due to Defensive Maturity
Injection, covering classical flaws such as SQL Injection (SQLi) and OS Command Injection, shifted downward in the ranking, dropping from A03:2021 to A05:2025.8 This movement is generally interpreted as a success story driven by industry adoption of modern, secure coding practices.
Contemporary enterprise applications benefit greatly from the mandated use of Object Relational Mappers (ORMs) and standardized frameworks that enforce parameterized queries by default.12 Furthermore, Static Application Security Testing (SAST) tools are highly effective at identifying the coding patterns (e.g., dynamic query construction) that lead to Injection vulnerabilities early in the development lifecycle.14
However, the decline in rank must be analyzed with caution. While the overall prevalence has dropped, industry statistics indicate that SQL Injection (CWE-89) remains the most common critical web application vulnerability in security assessments.16 This suggests a bifurcation in the threat landscape: while new applications are largely protected by design, a significant portion of the critical risk resides in complex, legacy systems or in cases where ORM layers are bypassed or improperly implemented by accepting unsanitized input parameters.12 Attackers are also adapting, shifting focus to advanced and context-dependent injection types like Object-Relational Mapping (ORM) injection, template injection, and deserialization flaws. Robust mitigation requires a layered security approach, combining parameterized queries with positive server-side input validation (safelisting) that strictly enforces expected data formats.13
IV. Expanding the Perimeter: Systemic Failures (A03 and A10)
The introduction of A03 (Software Supply Chain Failures) and A10 (Mishandling of Exceptional Conditions) underscores the strategic importance of risks that span beyond application code and into external dependencies and operational resilience.
IV.A. A03: Software Supply Chain Failures (Elevation and Expansion)
A03:2025 replaces and significantly expands the scope of A06:2021 (Vulnerable and Outdated Components).1 The new category elevates the risk to the third leading position, encompassing the entire software creation ecosystem, including dependencies, build systems, CI/CD pipelines, and software distribution infrastructure.1
Despite the noted difficulties in identifying supply chain weaknesses through standard vulnerability metrics (only 11 related CVEs are noted in one data source), A03 demonstrates high practical prevalence.17 Critically, this category registers the highest average incidence rate at 5.19% among all categories in the contributed testing data, confirming that supply chain issues are a pervasive and frequent source of failures in modern applications.17 This high incidence rate, combined with the difficulty in mapping these failures to individual CVEs, suggests that the primary danger lies in systemic compromise—such as build tampering or dependency confusion—rather than just the isolated use of an outdated library.
The elevation of this risk mandates that security teams treat supply chain integrity as a fundamental, non-functional requirement. Mitigation must involve a holistic approach: leveraging Software Composition Analysis (SCA) to identify direct and transitive dependencies, generating robust Software Bill of Materials (SBOMs), and enforcing strict hardening and access controls across the entire CI/CD pipeline.11
Expansion of A03: Software Supply Chain Failures (2025 Scope)
IV.B. A10: Mishandling of Exceptional Conditions (The Reconnaissance Enabler)
A10: Mishandling of Exceptional Conditions is an entirely new category for 2025, addressing critical failures in error handling and application resilience.1 This category aggregates 24 CWEs that focus on logical errors, failing "open" instead of "closed," and, most commonly, the exposure of sensitive information via verbose error messages.1
This category directly validates the practical experience of penetration testers, where leaked stack traces or detailed exception messages significantly reduce the effort required for exploitation. A verbose error message, for instance, might reveal the underlying database dialect, internal file paths, or specific application versions.1 This information acts as advanced intelligence, allowing an attacker to bypass hours of manual reconnaissance and precision-target a critical flaw, such as an Injection (A05) or an Access Control (A01) vulnerability.
A10 frames these weaknesses as failures in design philosophy, not just coding mistakes. Secure architecture demands that systems are designed to react safely to abnormal inputs, memory errors, or unhandled exceptions, ensuring they "fail closed" to maintain integrity and confidentiality.1
V. Strategic Mitigation Roadmaps and DevSecOps Integration
Addressing the refined OWASP Top 10: 2025 requires integrating security controls earlier and more deeply into the development lifecycle, focusing on automated verification of policy, architectural resilience, and comprehensive perimeter protection.
V.A. Architecting Resilience against Access Control and Misconfiguration (A01, A02)
To combat the pervasive nature of A01 and A02, organizations must move beyond simple code review and implement architectural controls:
A01 Mitigation (Access Control): Authorization logic must be centralized and separated from application logic using Policy as Code (PaC). This approach, leveraging frameworks like Attribute-Based Access Control (ABAC), ensures granular, consistent, and automated authorization enforcement across all API routes and methods.18 For SSRF containment, organizations must adopt Zero Trust principles internally, enforcing network segmentation, applying safelisting to all URL inputs, and blocking access to sensitive internal services (like cloud metadata endpoints).10
A02 Mitigation (Misconfiguration): Due to the rise of IaC and cloud-native environments, mitigation must start at the infrastructure layer. Organizations should mandate the use of secure, pre-validated IaC templates that enforce secure defaults and the Principle of Least Privilege (PoLP) for all cloud resources.7 Furthermore, continuous monitoring through tools like AWS Config or Terraform Drift Detection is necessary to prevent configuration divergence between the deployed infrastructure and the secure baseline.7
V.B. Hardening the Development Pipeline (A03, A05)
The shift toward managing external and systemic risk requires rigorous policy enforcement within the DevSecOps pipeline.
A03 Mitigation (Supply Chain): Organizations must utilize Software Composition Analysis (SCA) tools to gain complete visibility into both direct and transitive dependencies and proactively forbid reliance on obsolete or unmaintained components (CWE-477, CWE-1104).11 Rigorous pipeline hardening is essential, requiring code signing, artifact verification, and strict access control across all CI/CD components to ensure the integrity of the build and distribution process.11 Generation and verification of Software Bill of Materials (SBOMs) is a necessity.
A05 Mitigation (Injection): While ORMs provide significant protection, they are not silver bullets. Development mandates should enforce the use of parameterized queries exclusively. This should be coupled with a layered defense using positive server-side input validation (safelisting) for all user input, ensuring that data meets strict format requirements before processing.13 Dynamic Application Security Testing (DAST) remains critical for verifying the exploitability of advanced injection types that SAST tools may miss in complex runtime environments.14
V.C. Mitigating Exploitation Facilitators (A10)
The mitigation of A10 focuses on secure application design and information hygiene:
Secure Failure Philosophy: The application must adopt a "fail closed" mindset, particularly for critical logic pathways such as authentication and authorization.1 This means that in the event of an unrecoverable failure, the default state should be to deny access.
Standardized Error Handling: A global, centralized exception handler must be implemented to catch raw system errors. This handler must prevent sensitive details, such as stack traces, database details, or configuration file contents, from being exposed to the client via API responses or HTML pages.1 While detailed logging must be maintained internally (addressing A09: Logging and Alerting Failures), the information presented to the end-user must be generic and non-informative.
VI. Quantitative Data Comparison: OWASP 2021 vs. 2025 (RC1)
The following table summarizes the key structural changes in the OWASP Top 10: 2025 Release Candidate, highlighting the evolution of risk modeling toward systemic failure modes.
Quantitative Data Comparison: OWASP 2021 vs. 2025 (RC1)
Works cited
OWASP Top 10 2025: Official List, Changes, and What Developers Need to Know - Aikido, accessed November 7, 2025, https://www.aikido.dev/blog/owasp-top-10-2025-changes-for-developers
OWASP Top Ten, accessed November 7, 2025, https://owasp.org/www-project-top-ten/
What is SSRF (Server-side request forgery)? Tutorial & Examples | Web Security Academy, accessed November 7, 2025, https://portswigger.net/web-security/ssrf
A01 Broken Access Control - OWASP Top 10:2025 RC1, accessed November 7, 2025, https://owasp.org/Top10/2025/A01_2025-Broken_Access_Control/
Introduction - OWASP Top 10:2025 RC1, accessed November 7, 2025, https://owasp.org/Top10/A00_2021_Introduction/
OWASP Global AppSec conference: The new Top 10 list, accessed November 7, 2025, https://www.scworld.com/resource/owasp-global-appsec-conference-the-new-top-10-list
IaC Security: 10 Best Practices for Securing Infrastructure as Code | Learner - NUSites, accessed November 7, 2025, https://sites.northwestern.edu/learner/iac-security-practices-for-securing-infrastructure-as-code/
Introduction - OWASP Top 10:2025 RC1, accessed November 7, 2025, https://owasp.org/Top10/2025/0x00_2025-Introduction/
What Is Server-Side Request Forgery ( SSRF)? - F5, accessed November 7, 2025, https://www.f5.com/glossary/ssrf
OWASP Top Ten 2025 – The Complete Guide - Reflectiz, accessed November 7, 2025, https://www.reflectiz.com/blog/owasp-top-ten-2025/
OWASP Top 10 Adds A03:2025: Software Supply Chain Failures | Blog - Endor Labs, accessed November 7, 2025, https://www.endorlabs.com/learn/owasp-top-10-adds-a03-2025-software-supply-chain-failures
Testing for ORM Injection - WSTG - Latest | OWASP Foundation, accessed November 7, 2025, https://owasp.org/www-project-web-security-testing-guide/latest/4-Web_Application_Security_Testing/07-Input_Validation_Testing/05.7-Testing_for_ORM_Injection
Top 5 Best Practices for Preventing SQL Injection Attacks - Kiuwan, accessed November 7, 2025, https://www.kiuwan.com/blog/top-5-best-practices-for-developers-on-preventing-sql-injections-attacks/
2024 Software Vulnerability Snapshot | Black Duck, accessed November 7, 2025, https://www.blackduck.com/content/dam/black-duck/en-us/reports/software-vulnerability-snapshot.pdf
DAST vs. SAST: Getting Real on Static and Dynamic Application Security Testing - Invicti, accessed November 7, 2025, https://www.invicti.com/blog/web-security/dast-vs-sast-fact-check-on-static-and-dynamic-application-security-testing
2025 Vulnerability Statistics Report - Edgescan, accessed November 7, 2025, https://www.edgescan.com/stats-report/
A03 Software Supply Chain Failures - OWASP Top 10:2025 RC1, accessed November 7, 2025, https://owasp.org/Top10/2025/A03_2025-Software_Supply_Chain_Failures/
OWASP API Security Top 10 Risks - Wiz, accessed November 7, 2025, https://www.wiz.io/academy/owasp-api-security
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