EUVD-2026-66124
GHSA-gcx9-497g-6cp6
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Remotely reachable, no auth or interaction (AV:N/AC:L/PR:N/UI:N) where the vulnerable constraint ordering exists; bypass exposes and can alter protected resources (C:H/I:H) with no availability impact (A:N).
Primary rating from Vendor (apache).
CVSS VectorVendor: apache
Lifecycle Timeline
4DescriptionCVE.org
Improper Access Control, Incorrect Authorization vulnerability in Apache Tomcat leads to security constraint bypass if a constraint for a longer path is specified before a more restrictive constraint for a shorter sub-path.
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, from 8.5.0 through 8.5.100, from 7.0.0 through 7.0.109.
Users are recommended to upgrade to version 11.0.25, 10.1.58, 9.0.121, which fixes the issue.
Articles & Coverage 1
AnalysisAI
Security constraint bypass in Apache Tomcat (7.0.x through 11.0.x) lets remote unauthenticated attackers reach protected resources when a broader security constraint for a longer path is declared ahead of a more restrictive constraint for a shorter sub-path, causing the wrong constraint to be applied. The flaw (CVSS 9.1, CWE-284) exposes access-controlled application paths without valid credentials. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a specific web.xml configuration: a <security-constraint> for a longer URL path must be declared BEFORE a more restrictive <security-constraint> for a shorter sub-path of that path, causing Tomcat to apply the broader rule to the sub-path. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The signals are somewhat divergent and should be weighed together. … 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 | Upgrade to a fixed release for your branch: Vendor-released patch: 11.0.25, 10.1.58, or 9.0.121. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Audit all Apache Tomcat security constraint configurations (security-constraint entries in web.xml) across production and non-production environments running versions 7.0.x through 11.0.x, identifying instances where broader path constraints are declared before narrower ones. …
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When running Apache Tomcat versions 9.0.0.M1 to 9.0.0, 8.5.0 to 8.5.22, 8.0.0.RC1 to 8.0.46 and 7.0.0 to 7.0.81 with HTT
When using the Apache JServ Protocol (AJP), care must be taken when trusting incoming connections to Apache Tomcat. Rate
In SysAid On-Premise before 23.3.36, a path traversal vulnerability leads to code execution after an attacker writes a f
Remote code execution is possible with Apache Tomcat before 6.0.48, 7.x before 7.0.73, 8.x before 8.0.39, 8.5.x before 8
When running Apache Tomcat 7.0.0 to 7.0.79 on Windows with HTTP PUTs enabled (e.g. Rated high severity (CVSS 8.1), this
Denial of service against HTTP/2 server implementations allows remote unauthenticated attackers to exhaust server resour
MultipartStream.java in Apache Commons FileUpload before 1.3.1, as used in Apache Tomcat, JBoss Web, and other products,
The payload length in a WebSocket frame was not correctly validated in Apache Tomcat 10.0.0-M1 to 10.0.0-M6, 9.0.0.M1 to
When using a VirtualDirContext with Apache Tomcat 7.0.0 to 7.0.80 it was possible to bypass security constraints and/or
When using Apache Tomcat versions 10.0.0-M1 to 10.0.0-M4, 9.0.0.M1 to 9.0.34, 8.5.0 to 8.5.54 and 7.0.0 to 7.0.103 if a)
java/org/apache/coyote/http11/filters/ChunkedInputFilter.java in Apache Tomcat 6.x before 6.0.42, 7.x before 7.0.55, and
Missing encryption of cluster replication traffic in Apache Tomcat 11.0.20, 10.1.53, and 9.0.116 exposes sensitive sessi
Same weakness CWE-284 – Improper Access Control
View allSame technique Authentication Bypass
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External POC / Exploit Code
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