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Apache Tomcat EUVDEUVD-2026-85225

| CVE-2026-76183 CRITICAL
Authentication Bypass by Alternate Name (CWE-289)
2026-09-23 apache GHSA-q4fc-3vv4-fh24
Authentication Bypass Apache Java Red Hat Tomcat Suse Apache Tomcat Apache Software Foundation
9.8
CVSS 3.1 · Vendor: apache
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Severity by source

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

Unauthenticated network bypass with low complexity (AV:N/AC:L/PR:N); impact is scoped to whatever the protected WebSocket endpoint exposes, so C:H is plausible but I/A are application-dependent and conservatively lower.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
SUSE
9.1 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Red Hat
7.4 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
High

Lifecycle Timeline

7
Analysis Updated
Sep 23, 2026 - 16:29 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Sep 23, 2026 - 16:22 vuln.today
cvss_changed
CVSS changed
Sep 23, 2026 - 16:22 NVD
9.8 (CRITICAL)
Metadata Corrected
Sep 23, 2026 - 12:40 vuln.today
tag: Java added
Patch available
Sep 23, 2026 - 12:01 EUVD
Analysis Generated
Sep 23, 2026 - 11:51 vuln.today
CVE Published
Sep 23, 2026 - 11:16 cve.org
HIGH

DescriptionCVE.org

Authentication Bypass by Alternate Name vulnerability in Apache Tomcat allowed the security constraints for any WebSocket endpoint to be bypassed.

This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.25, from 10.1.0-M1 through 10.1.59, from 9.0.0.M1 through 9.0.121.

The following versions were EOS at the time the CVE was created but are known to be affected: from 8.5.0 through 8.5.100, from 7.0.43 through 7.0.109. Other unsupported versions may also be affected.

Users are recommended to upgrade to version 11.0.26, 10.1.60 or 9.0.122, which fix the issue.

Articles & Coverage 1

News Critical Authentication Bypass in Apache Tomcat - CVE-2026-76183 Sep 23, 2026

AnalysisAI

Authentication bypass in Apache Tomcat allows unauthenticated remote attackers to reach WebSocket endpoints that are supposed to be protected by container-managed security constraints, simply by referencing the endpoint under an alternate name so the constraint is never matched. Exploitation requires only that the application expose one or more WebSocket endpoints and rely on container-level (web.xml security-constraint) authentication or authorization rules to guard them; no credentials, no user interaction, and no non-default configuration beyond that are needed, and per the CVSS vector (PR:N) the attack is unauthenticated and network-reachable. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
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Execution
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Vulnerability AssessmentAI

Exploitation Exploitation requires the target application to (1) expose one or more WebSocket endpoints and (2) rely on Tomcat container-managed security constraints (web.xml security-constraint / authentication or authorization rules) to protect those endpoints. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment This is a genuinely high-priority issue on signal quality. … 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: Apache Tomcat 11.0.26, 10.1.60 or 9.0.122, as directed in the vendor advisory at https://lists.apache.org/thread/45mxk8nj2q8pkhct6lfxkvtm2jpywrsp; organizations still running the EOS lines 8.5.x or 7.0.x have no patched release on those branches and must migrate to a supported line (9.0.122, 10.1.60 or 11.0.26). … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, inventory every Tomcat instance and confirm exposure by checking running versions against the affected lines: 11.0.0-M1 through 11.0.25, 10.1.0-M1 through 10.1.59, 9.0.0.M1 through 9.0.121, and end-of-support 8.5.0-8.5.100 and 7.0.43-7.0.109, prioritizing internet-facing instances and any application that both exposes WebSocket endpoints and depends on web.xml security-constraint rules for authentication or authorization; where immediate upgrade is not possible, apply interim mitigation by enforcing authentication and authorization for WebSocket endpoints inside the application itself or at the reverse proxy/WAF layer rather than relying on container-managed constraints, and restrict network reachability to affected endpoints. …

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Vendor StatusVendor

SUSE

Severity: Critical
Product Status
SUSE Linux Enterprise Desktop 15 SP7 SUSE Linux Enterprise Module for Basesystem 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS Fixed
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS Fixed
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS Fixed

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EUVD-2026-85225 vulnerability details – vuln.today
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