Threats / Craft CMS / CVE-2025-35939
CVE-2025-35939
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-06-22
Craft CMS vulnerability
Craft CMS contains an external control of assumed-immutable web parameter vulnerability allowing unauthenticated attackers to introduce arbitrary values including PHP code to known local file locations.
Verdict
Today item — known-exploited.
An unauthenticated remote attacker can manipulate web parameters to write malicious PHP code to the server filesystem, potentially enabling remote code execution when chained with other vulnerabilities.
01
Is it exploitable?
— the evidence, ranked above the scoreReported exploitation
2 independent public reports of in-the-wild exploitation are cataloged.Distinct reporting sources (vendor, incident response, government); open them for the underlying claims.
Exploited in the wild
Listed in the CISA Known Exploited Vulnerabilities catalog (added 2025-06-02).
Probability (EPSS)
EPSS 0.01119 — modeled likelihood of exploitation activity.EPSS is a daily-changing model output — open the source for today's value.
Severity / affected
Affected: Craft CMS, Craft CMS. Confirm exact fixed builds in the vendor advisory.
Weakness (CWE)
Mapped to CWE-472 CWE-472.CWE assignment from the public NVD record; the weakness class drives how the flaw is exploited.
WeaknessCWE-472 · CWE-472
02
Who’s exploiting it?
— attribution turns risk into urgencyAttribution not established
No confirmed (advisory-backed) threat-actor attribution is established for this record. Absence of a named actor is not absence of compromise — see Coverage & confidence.
03
Why it matters
— the attack path, told twice: adversary, then board1
Front door — unauthenticated access narrative 1
Attacker
I craft a malicious HTTP request with arbitrary values targeting a known local file parameter on the Craft CMS application.
Business
The organization's web application becomes a vector for arbitrary code injection without requiring authentication.
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
I inject PHP code through the vulnerable parameter, writing it to a predictable server-side file location.
Business
Malicious code persists on the server infrastructure, establishing a foothold for further exploitation.
3
Lateral reach — past segmentation narrative 3
Attacker
I chain this vulnerability with CVE-2024-58136 to achieve remote code execution and gain control of the application server.
Business
The organization experiences full compromise of the affected Craft CMS instance and potential lateral movement within the infrastructure.
04
What to do
— defensible action- Remediate per the vendor advisory — confirm the fixed build for your version and verify exposure.1
Say it to the boardA vulnerability with this evidence profile is a defensible budget line, not a backlog ticket — fund the change against the proof above.
05
Coverage & confidence
— what we know, and what we don’tEstablished (cited)
Coverage gaps — stated, not hidden
Disclosure & credit2
Catalogued by cisa-cgCNA
Credited with finding itJoel Land, undefinedunspecified