CVE-2025-35939
Description
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.
How to fix
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
CISA due date: Jun 23, 2025- craftcms craft_cms4.15.3, 5.7.5 or later
- craftcms/cms5.7.5, 4.15.3 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| craftcms craft_cms | v < 4.15.3, 5.0.0 ≤ v < 5.7.5 | 4.15.3, 5.7.5 |
| craftcms/cmsPackagist | 5.0.0-alpha.1 ≤ v < 5.7.5, v < 4.15.3 | 5.7.5, 4.15.3 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.