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.

The version of Craft CMS installed on the remote host is prior to 4.15.3 or 5.x prior to 5.7.5. It is, therefore, affected by an external control of assumed-immutable web parameter 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. (CVE-2025-35939)  

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - 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. (CVE-2025-35939)

ID	Name	Product	Family	Severity
253648	Craft CMS < 4.15.3 / 5.x < 5.7.5 External Control of Assumed-Immutable Web Parameter	Nessus	Misc.	medium
434322	SCA: security update for craftcms/cms (GHSA-7vrx-9684-xrf2)	Tenable Cloud Security	SCA Checks	medium
434322	SCA: security update for craftcms/cms (GHSA-7vrx-9684-xrf2)	Tenable Self-Hosted Container Security	SCA Checks	medium

Detections

Analytics

CVE-2025-35939

medium

Tenable Plugins

medium

medium

medium