CVE-2025-55668 Apache Tomcat - Session fixation via rewrite valve
Severity: Moderate
Vendor: The Apache Software Foundation
Versions Affected:
Apache Tomcat 11.0.0-M1 to 11.0.7
Apache Tomcat 10.1.0-M1 to 10.1.41
Apache Tomcat 9.0.0.M1 to 9.0.105
Older, EOL versions may also be affected
Description:
If the rewrite valve was enabled for a web application, an attacker was
able to craft a URL that, if a victim clicked on it, would cause the
victim's interaction with that resource to occur in the context of the
attacker's session.
Mitigation:
Users of the affected versions should apply one of the following
mitigations:
- Upgrade to Apache Tomcat 11.0.8 or later
- Upgrade to Apache Tomcat 10.1.42 or later
- Upgrade to Apache Tomcat 9.0.106 or later
Credit:
Greg K (https://github.com/gregk4sec)
History:
2025-08-13 Original advisory
References:
[1] https://tomcat.apache.org/security-11.html
[2] https://tomcat.apache.org/security-10.html
[3] https://tomcat.apache.org/security-9.html
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