Craft CMS External Control of Assumed-Immutable Web Parameter Vulnerability (CVE-2025-35939)
Severity: medium · Patch status: patched · Since 2025-06-02 · CVE-2025-35939
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. CISA added CVE-2025-35939 to its Known Exploited Vulnerabilities catalog on Jun 2, 2025, which means attackers are exploiting it in the wild.
What to do
- Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- US federal agencies must remediate by Jun 23, 2025 (BOD 22-01); treat that as the outer limit.
Sources
All live incidents on Threat Watch