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.
CISA Known Exploited Vulnerability
Date added 2025-06-02 | Due date 2025-06-23
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Problem types
CWE-472 External Control of Assumed-Immutable Web Parameter
Product status
Any version before 5.7.5
5.7.5
Any version before 4.15.3
4.15.3
Credits
Joel Land, undefined
References
www.cisa.gov/...erabilities-catalog?field_cve=CVE-2025-35939
github.com/craftcms/cms/pull/17220 (url)
github.com/craftcms/cms/releases/tag/4.15.3 (url)
github.com/craftcms/cms/releases/tag/5.7.5 (url)
www.cve.org/CVERecord?id=CVE-2025-35939 (url)
raw.githubusercontent.com/...IT/white/2025/va-25-147-01.json (url)
