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Apache Tomcat EUVDEUVD-2026-66124

| CVE-2026-65182 CRITICAL
Improper Access Control (CWE-284)
2026-08-25 security@apache.org GHSA-gcx9-497g-6cp6
Authentication Bypass Apache Red Hat Tomcat Suse
9.1
CVSS 3.1 · Vendor: apache
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Severity by source

Vendor (apache) PRIMARY
9.1 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
vuln.today AI
9.1 CRITICAL

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).

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
SUSE
7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Red Hat
8.2 HIGH
qualitative

Primary rating from Vendor (apache).

CVSS VectorVendor: apache

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

Lifecycle Timeline

4
Analysis Generated
Aug 26, 2026 - 16:27 vuln.today
CVSS changed
Aug 26, 2026 - 16:22 NVD
9.1 (CRITICAL)
CVE Published
Aug 25, 2026 - 22:17 cve.org
CRITICAL 9.1
CVE Published
Aug 25, 2026 - 22:17 cve.org
UNKNOWN (no severity yet)

Blast Radius

ecosystem impact
† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth
  • 2 maven packages depend on org.apache.tomcat.embed:tomcat-embed-core (2 direct, 0 indirect)
  • 2 maven packages depend on org.apache.tomcat:tomcat-catalina (2 direct, 0 indirect)

Ecosystem-wide dependent count for version 11.0.0-M1 and other introduced versions.

DescriptionCVE.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

News Critical Security Constraint Bypass in Apache Tomcat - CVE-2026-65182 Aug 26, 2026

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

Access
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Delivery
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Exploit
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Execution
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Impact
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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.
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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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Vendor StatusVendor

SUSE

Severity: Important
Product Status
SUSE Linux Enterprise Module for Web and Scripting 15 SP7 Affected
SUSE Linux Enterprise Module for Web and Scripting 15 SP7 Affected
SUSE Linux Enterprise Module for Web and Scripting 15 SP7 Affected
SUSE Linux Enterprise Server 15 SP7 Affected
SUSE Linux Enterprise Server 15 SP7 Affected

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EUVD-2026-66124 vulnerability details – vuln.today
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