CVE-2025-35939
Actively exploited. CVE-2025-35939 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2025-06-02) — exploitation has been observed in the wild, and US federal agencies are required to remediate it under BOD 22-01. Treat patching as urgent.
Craft CMS contains an external control of assumed-immutable web parameter vulnerability. This vulnerability could allow an unauthenticated client to introduce arbitrary values, such as PHP code, to a known local file location on the server. This vulnerability could be chained with CVE-2024-58136 as represented by CVE-2025-32432.
CSIRTS triage
- What
- This vulnerability could allow an unauthenticated client to introduce arbitrary values, such as PHP code, to a known local file location on the server.
- Who is affected
- Craft CMS installations are affected by this vulnerability.
- Urgency
- Remediation is urgent as exploitation is confirmed and the severity is critical.
- Action
- Update to the latest version to mitigate the vulnerability.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Exploitation confirmedAlready exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 62% of all EPSS-scored CVEs.
Advisory coverage (1)
- criticalexploitedCVE-2025-35939: Craft CMS External Control of Assumed-Immutable Web Parameter Vulnerabilitycisa-kev · 2025-06-02
External references
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[](https://www.csirts.com/cve/CVE-2025-35939)