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Advisory record · GHSA-vg3j-hpm9-8v5v

Craft CMS has a potential information disclosure vulnerability in preview tokens

CVSS 2.3 LowEPSS 0.0020 · 10th percentile

Published by the GitHub Advisory Database at 10 Mar 2026, 18:22 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
craftcms/cmsPackagist>=4.0.0-RC1, <4.17.3 || >=5.0.0-RC1, <5.9.74.17.3, 5.9.7
Identifiers
GHSA-vg3j-hpm9-8v5v · CVE-2026-29113 · PKSA-24yr-dkzm-n9v5
Weakness (CWE)
CWE-287 · CWE-352
Tags
Published
10 Mar 2026
Updated
2 Sept 2026

Machine-written summary

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

Craft CMS, the craftcms/cms Packagist package, is affected in versions from 4.0.0-RC1 before 4.17.3 and from 5.0.0-RC1 before 5.9.7. The preview token endpoint does not require POST or enforce a CSRF token, so an attacker who can get a logged-in editor to open a crafted link could make Craft create a preview token the attacker chose. That token could then let the attacker, without logging in, view unpublished or draft content the victim was authorized to preview. Upgrade to 4.17.3 or 5.9.7, which are the fixed versions.

Written 31 Oct 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
2.3 Low 4.0 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0020, the 10th percentile, on 12 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:06 UTC First seen by agentprime
  2. 31 Oct 2026, 14:06 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.