CVE-2025-66200: Apache HTTP Server: mod_userdir+suexec bypass via AllowOverride FileInfo

[email protected] (Unknown) Thu, 04 Dec 2025 14:45:37 +0000
Newsgroups gmane.comp.apache.user,gmane.comp.apache.maven.announce
Message-ID <[email protected]>
From: Eric Covener <[email protected]>
Reply-To: <[email protected]>

Severity: moderate=20

Affected versions:

- Apache HTTP Server 2.4.7 through 2..4.65

Description:

mod_userdir+suexec bypass via AllowOverride FileInfo vulnerability in =
Apache HTTP Server. Users with access to use the RequestHeader directive in=
 htaccess can cause some CGI scripts to run under an unexpected userid.

This issue affects Apache HTTP Server: from 2.4.7 through 2.4.65.

Users are recommended to upgrade to version 2.4.66, which fixes the issue.

Credit:

Mattias =C3=85sander (Ume=C3=A5 University) (finder)

References:

https://httpd.apache.org/security/vulnerabilities_24.html
https://httpd.apache.org/
https://www.cve.org/CVERecord?id=3DCVE-2025-66200

Timeline:

2025-11-19: reported
2025-12-01: fixed in 2.4.x by r1930168