Improper authentication in Apache Tomcat - CVE-2026-55957
Published: June 30, 2026 / Updated: July 1, 2026
Vulnerability identifier: #VU135861
CSH Severity: Medium
CVSS v4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-55957
CWE-ID: CWE-287
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to bypass authentication.
The vulnerability exists due to improper authentication in JNDIRealm when authenticating binds using GSSAPI. A remote attacker can authenticate without providing the correct password to bypass authentication.
Affected software
Apache Tomcat
openEuler
tomcat
tomcat-help
tomcat-jsvc
openEuler
tomcat
tomcat-help
tomcat-jsvc
How to mitigate CVE-2026-55957
Install security update from vendor's website.
Apache Tomcat - addressed in versions 9.0.102, 10.1.39, 11.0.5
tomcat - update to 9.0.119-1
tomcat-help - update to 9.0.119-1
tomcat-jsvc - update to 9.0.119-1
tomcat - update to 9.0.119-1
tomcat-help - update to 9.0.119-1
tomcat-jsvc - update to 9.0.119-1
External References
- https://tomcat.apache.org/security-10.html#Fixed_in_Apache_Tomcat_10.1.39
- https://github.com/apache/tomcat/commit/0cd21c0393b8811af22daddbba7b4e7328e2d79e
- https://tomcat.apache.org/security-11.html#Fixed_in_Apache_Tomcat_11.0.5
- https://tomcat.apache.org/security-9.html#Fixed_in_Apache_Tomcat_9.0.102
- https://lists.apache.org/thread/j5s5pdyr5fwp1s96hmc398tn6k0gbsc5