Security Resilience

CWE · MITRE source

CWE-603Use of Client-Side Authentication

Abstraction: Base · CVEs in our corpus: 27

A client/server product performs authentication within client code but not in server code, allowing server-side authentication to be bypassed via a modified client that omits the authentication check.

Client-side authentication is extremely weak and may be breached easily. Any attacker may read the source code and reverse-engineer the authentication mechanism to access parts of the application which would otherwise be protected.

Last updated: 14 October 2026 20:41 UTC

Control responseHuman-reviewed

Answering this weakness across the control lifecycle, from our framework cross-walks.

Prevent
Stop it (NIST 800-53 / CSF Protect)
  • PR.AA-03
  • IA-2 Identification and Authentication (Organizational Users)
  • AC-3 Access Enforcement
Detect
Catch it (CSF Detect / Respond)

—

Harden
Shrink the surface (DISA STIG)

—

Validate
Prove the fix (OWASP ASVS)
  • V10.4.10
  • V10.4.16
  • V12.3.5

NIST 800-53 r5 controls PROPOSED for this weakness (0)AI-assisted

These are model PROPOSALS, not graded mappings. They come from controls_to_cwe_proposals, which carries no grade field at all; across the CWE pages 1,540 of 1,722 such associations (89%) have never been graded by anything. The heading said “address” until 2026-09-29, which asserted a relationship the data does not carry. Graded cross-walks are on the framework map, not here.

Control Title Family Why it addresses this CWE
No NIST controls proposed yet.

Top CVEs of this weakness type, ranked by Risk Priority

CVE Risk CVSS EPSS Published
CVE-2022-3218 9.99.80.74192022-09-19
CVE-2017-7909 7.79.80.02622017-05-06
CVE-2022-33139 7.59.80.01232022-06-21
CVE-2024-39375 7.49.80.00572024-06-27
CVE-2026-1363 7.49.80.00592026-01-23
CVE-2026-711877.49.80.00782026-08-28
CVE-2025-12868 7.39.80.00552025-11-10
CVE-2020-7591 6.88.80.01482020-10-15
CVE-2020-6988 6.47.50.04022020-03-16
CVE-2025-61940 6.28.30.00322025-12-02
CVE-2025-62650 6.18.30.00502025-10-17
CVE-2026-909836.18.20.00262026-10-09
CVE-2025-24517 6.07.50.00802025-03-31
CVE-2021-43355 5.97.30.00982022-01-21
CVE-2026-769455.97.50.00502026-08-28
CVE-2024-28627 5.87.50.00432024-04-23
CVE-2024-45785 5.87.50.00432024-10-25
CVE-2025-30042 5.57.80.00092026-03-02
CVE-2026-66305 5.57.10.00532026-09-08
CVE-2020-27266 5.26.50.00592021-01-19
CVE-2024-52327 5.16.50.00482025-01-23
CVE-2025-62649 4.65.80.00512025-10-17
CVE-2026-8830 3.74.30.00442026-05-19
CVE-2026-3096 3.74.70.00292026-09-10