⚠ Actively exploited
Added to CISA KEV on 2025-06-02. Federal agencies required to patch by 2025-06-23. 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..
CVE-2025-35939 — External Control of Assumed-Immutable Web Parameter in CMS
Severity
6.9MEDIUMNVD
VulnCheck9.0CISA9.8
EPSS
33.1%
top 3.10%
CISA KEV
KEV
Added 2025-06-02
Due 2025-06-23
Exploit
No known exploits
Affected products
Timeline
PublishedMay 7
KEV addedJun 2
KEV dueJun 23
Latest updateMar 11
CISA 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.
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…
CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Affected Packages4 packages
Patches
🔴Vulnerability Details
7OSV
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GHSA
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