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Apache Tomcat EUVDEUVD-2026-85224

| CVE-2026-75973 HIGH
Improper Authentication (CWE-287)
2026-09-23 apache GHSA-q9fp-9gfr-vj9g
Authentication Bypass Apache Java Red Hat Tomcat Suse Apache Tomcat Apache Software Foundation
7.3
CVSS 3.1 · Vendor: apache
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Severity by source

Vendor (apache) PRIMARY
7.3 LOW
AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
vuln.today AI
5.6 MEDIUM

Network-reachable and unauthenticated (AV:N/PR:N), but AC:H because it needs a non-default shared-provider config and depends on authentication ordering; impact is limited realm confusion, hence C:L/I:L/A:L.

3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
4.0 AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N
SUSE
6.5 MEDIUM
AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Red Hat
LOW
qualitative

Primary rating from Vendor (apache).

CVSS VectorVendor: apache

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

Lifecycle Timeline

6
Analysis Updated
Sep 23, 2026 - 16:33 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
7.3 (HIGH)
Metadata Corrected
Sep 23, 2026 - 12:40 vuln.today
tag: Java added
Analysis Generated
Sep 23, 2026 - 11:52 vuln.today
CVE Published
Sep 23, 2026 - 11:14 cve.org
LOW

DescriptionCVE.org

Improper Authentication vulnerability in Apache Tomcat. When Jakarta Authentication was configured with SimpleAuthConfigProvider as the default provider and multiple web application used that provider, the realm for the first web application to authenticate a request would be used for all web applications.

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.M4 through 9.0.121.

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. Other unsupported versions may also be affected.

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

AnalysisAI

Cross-application authentication realm leakage in Apache Tomcat's Jakarta Authentication integration causes requests to be validated against the realm established by whichever co-hosted web application authenticated first, breaking per-application authentication boundaries. The flaw (CWE-287, improper authentication) affects Tomcat 11.0.0-M1 through 11.0.25, 10.1.0-M1 through 10.1.59, and 9.0.0.M4 through 9.0.121, plus end-of-life 8.5.0 through 8.5.100. …

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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, non-default deployment: Jakarta Authentication must be configured with SimpleAuthConfigProvider as the DEFAULT provider, AND two or more web applications on the same Tomcat instance must use that provider. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment This is an Apache-reported improper-authentication flaw (CWE-287) with a vendor CVSS of 7.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L) - network vector, no privileges, but only Low impact across confidentiality, integrity and availability. … 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 11.0.26, 10.1.60, or 9.0.122 as appropriate for the affected branch, and treat the affected EOL 8.5.x line as unsupported - migrate to a maintained branch with the fix. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, inventory every Apache Tomcat deployment against the affected ranges (8.5.0-8.5.100, 9.0.0.M4-9.0.121, 10.1.0-M1-10.1.59, and 11.0.0-M1-11.0.25) and determine whether SimpleAuthConfigProvider is configured as the default Jakarta Authentication provider and whether two or more web applications share it; where that non-default configuration exists, immediately isolate each application into its own Tomcat instance or JVM or assign each a distinct authentication realm, and enable detailed authentication logging to surface cross-realm anomalies. …

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Threat intelligence, references, and detailed analysis are available after sign-in.

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Vendor StatusVendor

SUSE

Severity: Moderate
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-2026-85224 vulnerability details – vuln.today
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