Headline
GHSA-7vrx-9684-xrf2: Craft CMS stores arbitrary content provided by unauthenticated users in session files
Craft CMS stores arbitrary content provided by unauthenticated users in session files. This content could be accessed and executed, possibly using an independent vulnerability. Craft CMS redirects requests that require authentication to the login page and generates a session file on the server at /var/lib/php/sessions. Such session files are named sess_[session_value], where [session_value] is provided to the client in a Set-Cookie response header. Craft CMS stores the return URL requested by the client without sanitizing parameters. Consequently, an unauthenticated client can introduce arbitrary values, such as PHP code, to a known local file location on the server. Craft CMS versions 5.7.5 and 4.15.3 have been released to address this issue.
- GitHub Advisory Database
- GitHub Reviewed
- CVE-2025-35939
Craft CMS stores arbitrary content provided by unauthenticated users in session files
Moderate severity GitHub Reviewed Published May 8, 2025 to the GitHub Advisory Database • Updated May 8, 2025
Package
Affected versions
>= 5.0.0-alpha.1, < 5.7.5
< 4.15.3
Patched versions
5.7.5
4.15.3
Craft CMS stores arbitrary content provided by unauthenticated users in session files. This content could be accessed and executed, possibly using an independent vulnerability. Craft CMS redirects requests that require authentication to the login page and generates a session file on the server at /var/lib/php/sessions. Such session files are named sess_[session_value], where [session_value] is provided to the client in a Set-Cookie response header. Craft CMS stores the return URL requested by the client without sanitizing parameters. Consequently, an unauthenticated client can introduce arbitrary values, such as PHP code, to a known local file location on the server. Craft CMS versions 5.7.5 and 4.15.3 have been released to address this issue.
References
- https://nvd.nist.gov/vuln/detail/CVE-2025-35939
- craftcms/cms#17220
- https://github.com/craftcms/cms/releases/tag/4.15.3
- https://github.com/craftcms/cms/releases/tag/5.7.5
- craftcms/cms@e4c7bac
Published to the GitHub Advisory Database
May 8, 2025