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CVE-2025-35939: Craft CMS External Control of Assumed-Immutable Web Parameter Vulnerability

criticalknown exploitedCVE-2025-35939
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation 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

vendor: Craft CMSproduct: Craft CMSCode injectionOther
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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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2025-06-02
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2025-35939

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2025-35939coverage & exploitation statusNVD · CVE.org

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