Vulnerability details
CVE-2025-35939
Actively exploitedCraft CMS stores user-provided content in session files
Remedy
Required action (CISA): 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: 2025-06-23)
- CMS — version 5.7.5 and later
- CMS — version 4.15.3 and later
Official 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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 6.9Medium | 4.0 | CVEProject cvelistV5 (CNA) (cisa-cg) | 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 |
| 5.3Medium | 3.1 | CVEProject cvelistV5 (CNA) (cisa-cg) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| Craft | CMS | v < 5.7.5 | CVEProject cvelistV5 (CNA) |
| Craft | CMS | v < 4.15.3 | CVEProject cvelistV5 (CNA) |
References and advisories
6- https://github.com/craftcms/cms/pull/17220
- https://github.com/craftcms/cms/releases/tag/4.15.3
- https://github.com/craftcms/cms/releases/tag/5.7.5
- https://www.cve.org/CVERecord?id=CVE-2025-35939
- https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2025/va-25-147-01.json
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-35939 government-resource
Details
- Published
- 2025-05-08
- Last updated
- 2026-02-26
- State
- Published
- Assigner (CNA)
- cisa-cg
- Kolun priority
- 68 · High
CISA KEV catalog
- Date added
- 2025-06-02
- Due date
- 2025-06-23
- Used in ransomware
- Unknown
Exploit prediction (EPSS)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- Active
- Technical impact
- Partial
Weaknesses (CWE)
- CWE-472External Control of Assumed-Immutable Web Parameter