Improper authentication in Apache Tomcat - CVE-2026-55957
Published: June 30, 2026
Vulnerability identifier: #VU135861
CSH Severity: Medium
CVSS v4.0: 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/E:U/U:Green
CVE-ID: CVE-2026-55957
CWE-ID: CWE-287
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Apache Foundation
Affected software:
Apache Tomcat
Apache Tomcat
Detailed vulnerability description
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.
How to mitigate CVE-2026-55957
Install security update from vendor's website.
Sources
- 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