CVE-2025-35939
MEDIUM CISA KEVCVSS v3
5.3
MEDIUM
EPSS Score
—
exploit probability
CISA KEV
Yes
known exploited
Exploitation
—
SSVC status
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 request
CISA Known Exploited Vulnerability
- Date Added
- 6/2/2025
- Patch Due Date
- 6/23/2025
- Required Action
- Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Technical Details
- CVSS v3 Vector
- 3.1
- Published
- 5/7/2025
- Last Modified
- 10/24/2025
Frequently Asked Questions
What is CVE-2025-35939?
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 request
Is CVE-2025-35939 actively exploited?
Yes. CVE-2025-35939 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 6/23/2025.
What is the CVSS score for CVE-2025-35939?
CVE-2025-35939 has a CVSS v3 base score of 5.3 (MEDIUM severity), with vector string 3.1.
Is CVE-2025-35939 affecting your environment?
Use isMalicious to check if any of your IPs or domains are associated with this vulnerability's IOCs.