CVE-2026-75973: CWE-287 Improper Authentication in Apache Software Foundation Apache Tomcat
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.
AI Analysis
Technical Summary
This vulnerability in Apache Tomcat relates to improper authentication handling when Jakarta Authentication is configured with SimpleAuthConfigProvider as the default provider. Specifically, when multiple web applications use this provider, the authentication realm from the first authenticated web application is incorrectly applied to all subsequent web applications, potentially allowing unauthorized access or authentication confusion across applications. The issue affects multiple major versions of Apache Tomcat, including some end-of-life versions. The vendor has released fixed versions to address this issue.
Potential Impact
The vulnerability can cause authentication realms to be shared improperly across multiple web applications, potentially allowing unauthorized access or authentication bypass in affected Apache Tomcat deployments. This undermines the isolation between web applications and can lead to security breaches where one application's authentication context is incorrectly applied to others.
Mitigation Recommendations
Users should upgrade affected Apache Tomcat installations to versions 11.0.26, 10.1.60, 9.0.122, or later, which contain fixes for this vulnerability. Applying these official updates is the recommended remediation. No other mitigations or temporary workarounds are indicated in the available data.
CVE-2026-75973: CWE-287 Improper Authentication in Apache Software Foundation Apache Tomcat
Description
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.
CVSS v3.1
Score 7.3high
Affected software
Apache Software Foundation
Apache Tomcat
pkg:maven/org.apache.tomcat/tomcatRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability in Apache Tomcat relates to improper authentication handling when Jakarta Authentication is configured with SimpleAuthConfigProvider as the default provider. Specifically, when multiple web applications use this provider, the authentication realm from the first authenticated web application is incorrectly applied to all subsequent web applications, potentially allowing unauthorized access or authentication confusion across applications. The issue affects multiple major versions of Apache Tomcat, including some end-of-life versions. The vendor has released fixed versions to address this issue.
Potential Impact
The vulnerability can cause authentication realms to be shared improperly across multiple web applications, potentially allowing unauthorized access or authentication bypass in affected Apache Tomcat deployments. This undermines the isolation between web applications and can lead to security breaches where one application's authentication context is incorrectly applied to others.
Mitigation Recommendations
Users should upgrade affected Apache Tomcat installations to versions 11.0.26, 10.1.60, 9.0.122, or later, which contain fixes for this vulnerability. Applying these official updates is the recommended remediation. No other mitigations or temporary workarounds are indicated in the available data.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- apache
- Date Reserved
- 2026-08-18T17:47:34.591Z
- State
- PUBLISHED
Threat ID: 6ab3b90df7a7c54106b30f1a
Added to database: 09/23/2026, 11:33:33 UTC
Last enriched: 09/23/2026, 11:48:23 UTC
Last updated: 09/24/2026, 01:57:04 UTC
Views: 7
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.