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Exploited vulnerability · CISA KEV

Is CVE-2025-35939 exploited? Yes: in CISA KEV since 2 Jun 2025

Gociux · Craft CMS · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2025-35939, Craft CMS External Control of Assumed-Immutable Web Parameter Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 2 Jun 2025, 26 days after it was published. It affects Craft CMS. If you run it, CISA's required action is: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

exploitedYesCISA KEV · 2 Jun 2025
ransomwareNot knownno confirmed use
EPSSbelow top 10%lower predicted activity right now (it is still confirmed exploited)
severity5.3CVSS 3.1 · medium
US federal due23 Jun 2025BOD 22-01 deadline

What it is

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.

VendorCraft CMS (4 exploited CVEs in KEV)
ProductCraft CMS
VulnerabilityCraft CMS External Control of Assumed-Immutable Web Parameter Vulnerability
WeaknessCWE-472
Published7 May 2025
Added to KEV2 Jun 2025
Reported by (CNA)cisa-cg

What to do

  1. Check whether you run it. Look for Craft CMS in your asset inventory, including appliances and cloud images. Stack check lists every exploited Craft CMS CVE at once.
  2. Apply the fix. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
  3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 7 May 2025.
  4. Get told next time. Email alerts when CISA adds a CVE for Craft CMS.

Other exploited CVEs in Craft CMS

References

Questions

Is CVE-2025-35939 being exploited?

Yes. CISA added CVE-2025-35939 to the Known Exploited Vulnerabilities catalog on 2 Jun 2025, which means there is reliable evidence of exploitation in the wild.

Is CVE-2025-35939 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2025-35939?

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Check Craft CMS's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Craft CMS and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in June 2025 · Craft CMS scorecard · act-now radar.

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