Craft CMS External Control of Assumed-Immutable Web Parameter Vulnerability. Actively exploited: CISA added this vulnerability to its Known Exploited Vulnerabilities catalog on 02/06/2025. Patch affected systems as an emergency.
| Package | Affected versions | Patched versions |
|---|---|---|
| craftcms/cms | ≥ 5.0.0-alpha.1, < 5.7.5< 4.15.3 | 5.7.54.15.3 |
| craft cms | ≥ 5.0.0, < 5.7.5< 4.15.3 | 5.7.54.15.3 |
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.
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