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Advisory record · GHSA-7vrx-9684-xrf2

Craft CMS stores arbitrary content provided by unauthenticated users in session files

CVSS 6.9 MediumCriticalIn CISA KEVEPSS 0.013 · 71st percentile

Critical, because:

  • In CISA’s KEV catalogue since 2 Jun 2025: it is known to be exploited.

How we decide what’s critical

Published by the GitHub Advisory Database at 8 May 2025, 00:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
craftcms/cmsPackagist>=5.0.0-alpha.1, <5.7.5 || <4.15.35.7.5, 4.15.3
Identifiers
GHSA-7vrx-9684-xrf2 · CVE-2025-35939 · PKSA-ht16-h36v-hxc7
Weakness (CWE)
CWE-472
Tags
Published
8 May 2025
Updated
22 Oct 2025

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Craft CMS versions before 4.15.3 and from 5.0.0-alpha.1 before 5.7.5 are affected. An unauthenticated attacker can make the site store arbitrary content, such as PHP code, in a session file on the server through the return URL parameter on login redirects, and the source says this content could be executed if combined with another vulnerability. Upgrade craftcms/cms to 4.15.3 or 5.7.5.

Written 3 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
6.9 Medium 4.0 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N CNA (cisa-cg)
  • CISA KEV Listed since 2 Jun 2025: known to be exploited.
  • EPSS 0.013, the 71st percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:26 UTC First seen by agentprime
  2. 31 Oct 2026, 14:26 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.