Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Craftcms | Craft Cms | < 4.15.3 |
Related Weaknesses (CWE)
References
- https://github.com/craftcms/cms/pull/17220Patch
- https://github.com/craftcms/cms/releases/tag/4.15.3Release Notes
- https://github.com/craftcms/cms/releases/tag/5.7.5Release Notes
- https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2025/Third Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2025-35939VDB Entry
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-US Government Resource
FAQ
What is CVE-2025-35939?
CVE-2025-35939 is a vulnerability with a CVSS score of 5.3 (MEDIUM). 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 req...
How severe is CVE-2025-35939?
CVE-2025-35939 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-35939?
Check the references section above for vendor advisories and patch information. Affected products include: Craftcms Craft Cms.