CVE-2025-35939 KEV
Patch first
On CISA KEV — known exploited in the wild, due 2025-06-23.
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.
Scoring
| CVSS | 5.3 (MEDIUM, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N |
| EPSS | 1.32% — more likely to be exploited than 70% of all CVEs |
| Weakness | CWE-472 |
| On CISA KEV | yes — remediate by 2025-06-23 |
| Public exploit | none known |
| Published | 2025-05-07 |
| Last modified | 2026-06-17 |
CISA KEV
| Name | Craft CMS External Control of Assumed-Immutable Web Parameter Vulnerability |
|---|---|
| Added | 2025-06-02 |
| Due | 2025-06-23 |
| Vendor / product | Craft CMS / Craft CMS |
| Ransomware use | none reported |
Affected (1)
| Vendor | Product |
|---|---|
| craftcms | craft cms |
References
- 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://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2025/va-25-147-01.json
- https://www.cve.org/CVERecord?id=CVE-2025-35939
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-35939
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