CVE-2026-55957

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.

CVSS v3.1

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

EPSS

2.86% chance of exploitation in the next 30 days, 86th percentile

Published

2026-06-29

Updated

2026-06-30

Proof-of-concept exploits (1)

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

References

• CVE Record
• NVD entry

Related

• CVE-2026-5595
• CVE-2026-5596
• CVE-2026-5594
• CVE-2026-5597
• CVE-2026-55890
• CVE-2026-55982