CVE-2025-35939: Craft CMS External Control of Assumed-Immutable Web Parameter Vulnerability
Affects Craft CMS Craft CMSSource CISA KEV
Mentioned vulnerabilities
Exploited in the wild · KEV due 23 Jun 2025 · 1% EPSS : apply the vendor's fix or mitigations to Craft CMS now.
Data as of 10/24/2026, 22:16:01 UTC
- Exploitation
Actively exploited – in CISA KEV since 06/02/2025
- KEV deadline
- 06/23/2025 US federal agencies must patch by this date; a sensible deadline for everyone else.
- EPSS
- 1.3% chance of exploitation in 30 days – higher than 71% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:NWhat to do
CISA required action
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
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.
Weaknesses
- CWE-472External Control of Assumed-Immutable Web Parameter (opens in a new tab)
Base weaknessOWASP Top 10 A06:2025: Insecure Design (opens in a new tab)
The web application does not sufficiently verify inputs that are assumed to be immutable but are actually externally controllable, such as hidden form fields.