CVE-2025-54656: Apache Struts Extras: Improper Output Neutralization for Logs

[Arnout Engelen <engelen () apache org>]

Severity: low 

Affected versions:

- Apache Struts Extras (org.apache.struts:struts-extras) before 2

Description:

** UNSUPPORTED WHEN ASSIGNED ** Improper Output Neutralization for Logs vulnerability in Apache Struts.

This issue affects Apache Struts Extras: before 2.

When using LookupDispatchAction, in some cases, Struts may print untrusted input to the logs without any filtering. 
Specially-crafted input may lead to log output where part of the message masquerades as a separate log line, confusing 
consumers of the logs (either human or automated). 

As this project is retired, we do not plan to release a version that fixes this issue. Users are recommended to find an 
alternative or restrict access to the instance to trusted users.

NOTE: This vulnerability only affects products that are no longer supported by the maintainer.

Credit:

Ryan Murphy of HeroDevs (finder)

References:

https://struts.apache.org/
https://www.cve.org/CVERecord?id=CVE-2025-54656