CVE-2026-55957

Apache Tomcat: Authentication bypass with JNDIRealm and GSSAPI authenticated bind

Missing Critical Step in Authentication vulnerability in Apache Tomcat when the JNDIRealm was configured to authenticate binds using GSSAPI allowed attackers to authenticate without provided the correct password. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.4, from 10.1.0-M1 through 10.1.36, from 9.0.0.M1 through 9.0.100, from 8.5.0 through 8.5.100, from 7.0.0 through 7.0.109. Users are recommended to upgrade to version 11.0.5, 10.1.37 or 9.0.101, which fixes the issue.

Affected

Apache Software Foundation · Apache Tomcat

CVSS v3.1 CNA

7.3 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

EPSS

2.85% chance of exploitation in the next 30 days, 87th percentile

Published

2026-06-29

Updated

2026-06-30

Proof-of-concept exploits (1)

• mdvpat/CVE-2026-55957-PoC0★ · 2026-08-07

Security advisories

• https://lists.apache.org/thread/7fk339o5jvd4mcgsf0chbrn4o525ccjh
• http://www.openwall.com/lists/oss-security/2026/06/29/26

References

• CVE Record
• NVD entry

Related

• CVE-2026-52832