CVE-2026-55957

Apache Tomcat: Authentication bypass with JNDIRealm and GSSAPI authenticated bind

State: Published
Severity: 7.3 High
Published: Jun 29, 2026
Updated: Jun 30, 2026
Reserved: Jun 17, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	7.3 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L	CISA-ADP

Weaknesses

CWE-304 Missing Critical Step in Authentication

Affected Products

Product	Versions
Apache TomcatApache Software Foundation	11.0.0-M1 through 11.0.4Affected 10.1.0-M1 through 10.1.36Affected 9.0.0.M1 through 9.0.100Affected 8.5.0 through 8.5.100Affected 7.0.0 through 7.0.109Affected before 7.0.0Unknown

References

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