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.

Metrics

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact Low

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact Low

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is in the KEV database since June 2, 2025.

The EPSS score is 0.18829.

Exploitation active

Automatable yes

Technical Impact partial

Affected Vendors & Products

Vendors Products
Craftcms Subscribe
Craft Cms Subscribe

Configuration 1 [-]

OR cpe:2.3:a:craftcms:craft_cms:*:*:*:*:*:*:*:*
cpe:2.3:a:craftcms:craft_cms:*:*:*:*:*:*:*:*

No data.

No data.

Advisories
Source ID Title
Github GHSA Github GHSA GHSA-7vrx-9684-xrf2 Craft CMS stores arbitrary content provided by unauthenticated users in session files
Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/craftcms/cms/pull/17220 cve-icon cve-icon
https://github.com/craftcms/cms/releases/tag/4.15.3 cve-icon cve-icon
https://github.com/craftcms/cms/releases/tag/5.7.5 cve-icon cve-icon
https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2025/va-25-147-01.json cve-icon cve-icon
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-35939 cve-icon cve-icon
https://www.cve.org/CVERecord?id=CVE-2025-35939 cve-icon cve-icon
History

Wed, 22 Oct 2025 08:15:00 +0900

Type Values Removed Values Added
References

Wed, 22 Oct 2025 05:30:00 +0900

Type Values Removed Values Added
References

Wed, 22 Oct 2025 04:30:00 +0900

Type Values Removed Values Added
References

Mon, 14 Jul 2025 22:45:00 +0900

Type Values Removed Values Added
Metrics epss

{'score': 0.4397}

 epss

{'score': 0.44911}

Thu, 05 Jun 2025 01:00:00 +0900

Type Values Removed Values Added
First Time appeared Craftcms
Craftcms craft Cms
Weaknesses NVD-CWE-Other
CPEs cpe:2.3:a:craftcms:craft_cms:*:*:*:*:*:*:*:*
Vendors & Products Craftcms
Craftcms craft Cms

Tue, 03 Jun 2025 08:15:00 +0900

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

 kev

{'dateAdded': '2025-06-02'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'active', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Thu, 29 May 2025 06:00:00 +0900

Type Values Removed Values Added
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. 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.
Title Craft CMS stores user-provided content session files Craft CMS stores user-provided content in session files
References

Thu, 29 May 2025 00:15:00 +0900

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Thu, 08 May 2025 07:45:00 +0900

Type Values Removed Values Added
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.
Title Craft CMS stores user-provided content session files
Weaknesses CWE-472
References
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N'}

cvssV4_0

{'score': 6.9, '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'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: cisa-cg

Published:

Updated: 2025-10-21T22:55:16.971Z

Reserved: 2025-04-15T20:57:14.329Z

Link: CVE-2025-35939

cve-icon Vulnrichment

Updated: 2025-05-28T14:17:43.824Z

cve-icon NVD

Status : Analyzed

Published: 2025-05-07T23:15:54.103

Modified: 2025-10-24T13:45:43.720

Link: CVE-2025-35939

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses