Vulnerability

CVE-2025-35939

Medium· 5.3KEVCVSS5.3EPSS1%

.rules3/5

Craft CMS External Control of Assumed-Immutable Web Parameter Vulnerability

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.

Threat signal

63/100

Elevated

Severity

medium

CVSS

5.3

EPSS

Active

KEV

CISA KEV — actively exploited

359d overdue

AffectedCraft CMS — Craft CMS

Added to KEV

2025-06-02

Federal patch due (BOD 22-01)

2025-06-23

Required action (CISA verbatim)

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Vendor advisory + references

CISA description: “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.”

CVSS

v3.1Open in FIRST calculator →

5.3/ 10MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Attack VectorNetworkExploitable remotely over the internet — no local access needed.
Attack ComplexityLowNo special conditions — exploit works reliably.
Privileges RequiredNoneUnauthenticated — no credentials needed.
User InteractionNoneFully automated — no victim action needed.
ScopeUnchangedImpact contained to the vulnerable component.
Confidentiality ImpactNoneNo confidentiality impact.
Integrity ImpactLowSome data modification; attacker doesn't fully control extent.
Availability ImpactNoneNo availability impact.

EPSS

Exploit prediction · 30-day horizonFIRST.org →

1.12%

probability of exploitation in next 30 days

p62

higher than 62% of all CVEs

6-day trend↓ 38.3pp

Mid-pack — moderate exploitation likelihood.

Vendor VEX

No VEX statements published for CVE-2025-35939. Vendors publish VEX (Vulnerability Exploitability eXchange) to assert per-product whether a CVE is actually exploitable in their distribution.

SSVCAttend

Active exploitation with limited impact — coordinate patching

exploitation: active
automatable: no
impact: partial
mission: support

Lifecycle

2025-06-02Added to CISA KEVransomware: Unknown
2025-06-02Published
2025-06-23Federal patch due (BOD 22-01)
2026-06-16Last modified1 source

No source-event history recorded yet. New revisions will appear here as ingestors re-fetch this CVE.