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Servers and applications

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…

Actively exploited: CISA added it to its Known Exploited Vulnerabilities catalog on 2 Jun 2025.

Severity
Medium 6.9
Published
7 May 2025
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Fixed in
4.15.3, 5.7.5
Sources
NVD

Affected software

SoftwareAffected versions
Craft CMSServers and applications · cpe:a:craftcms:craft_cms
  • Every version before 4.15.3
  • From 5.0.0 before 5.7.5

Known exploited

CISA name
Craft CMS External Control of Assumed-Immutable Web Parameter Vulnerability
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.
Due for US agencies
23 Jun 2025
Used in ransomware
Not known

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2025-35939
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2025-35939