EUVD-2026-66132
GHSA-h3x4-894j-xpx5
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Network-reachable FORM-auth request needs no privileges or interaction (AV:N/AC:L/PR:N/UI:N); the authorization bypass exposes and lets an attacker act on restricted resources (C:H/I:H) with no availability effect (A:N).
Primary rating from Vendor (apache).
CVSS VectorVendor: apache
Lifecycle Timeline
5DescriptionCVE.org
Incorrect Authorization vulnerability in Apache Tomcat's FORM authentication process allows the bypassing of a security constraint that limits user has access to a resource POST but not GET.
This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.24, from 10.1.0-M1 through 10.1.57, from 9.0.0.M1 through 9.0.120.
The following versions were EOL at the time the CVE was created but are known to be affected: from 8.5.0 through 8.5.100, from 7.0.0 through 7.0.109. Other unsupported versions may also be affected.
Users are recommended to upgrade to version 11.0.25, 10.1.58 or 9.0.121, which fixes the issue.
AnalysisAI
Authorization bypass in Apache Tomcat's FORM-based authentication lets attackers reach protected resources that a security constraint was meant to restrict, defeating rules that grant a role POST access but withhold GET (or vice versa) on the same URL. It affects Tomcat 11.0.0-M1 through 11.0.24, 10.1.0-M1 through 10.1.57, 9.0.0.M1 through 9.0.120, plus EOL 8.5.0-8.5.100 and 7.0.0-7.0.109. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a target application deployed on an affected Tomcat version that uses FORM-based authentication AND defines HTTP-method-specific security constraints (a constraint permitting one method such as POST while restricting another such as GET on the same resource). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Signals are mixed and should be weighed carefully. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Vendor-released patch: upgrade to Apache Tomcat 11.0.25, 10.1.58, or 9.0.121, which fix the issue on their respective branches. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify all Tomcat deployments running versions 9.0.0-9.0.120, 10.1.0-10.1.57, 11.0.0-11.0.24, 8.5.0-8.5.100, or 7.0.0-7.0.109, and assess which are exposed to untrusted networks. …
Sign in for detailed remediation steps and compensating controls.
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Same weakness CWE-863 – Incorrect Authorization
View allSame technique Authentication Bypass
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External POC / Exploit Code
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