High [CVE-2026-68569] Apache Tomcat: Principal lookup can fail open in some cases
This high-severity Apache Software Foundation advisory covers CVE-2026-68569 affecting Apache Tomcat.
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Summary
Improper Authentication vulnerability in Apache Tomcat meant that in some circumstances (e.g. CLIENT-CERT, SPNEGO) that a user would be authenticated even if the user did not exist in the DataSourceRealm.
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.
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, from 7.0.0 through 7.0.109.
Other unsupported versions may also be affected.
Users are recommended to upgrade to version 11.0.25, 10.1.58 or 9.0.121, which fix the issue.
- Apache Tomcat 11.0.0-M1 through 11.0.24
- Apache Tomcat 10.1.0-M1 through 10.1.57
- Apache Tomcat 9.0.0.M1 through 9.0.120
- Apache Tomcat 8.5.0 through 8.5.100
- Apache Tomcat 7.0.0 through 7.0.109
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
- 11.0.25
- 10.1.58
- 9.0.121
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
Mitigation checklist
- Users are recommended to upgrade to version 11.0.25, 10.1.58 or 9.0.121, which fix the issue.
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
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- CVE-2026-88041Oct 20, 2026Incomplete cleanup vulnerability in Apache Tomcat allowed an trailer information
- CVE-2026-80353Oct 20, 2026Time-of-check time-of-use (TOCTOU) race condition vulnerability in Apache Tomcat
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