Vulnerability Description
Craft CMS 5.0.0 through 5.10.12 (fixed in 5.10.13) contains a broken access control flaw in the nested-elements reorder endpoint. When an authenticated control panel user with viewEntries and viewPeerEntries (but without savePeerEntries) opens another author's entry in read-only mode, Craft unconditionally grants that session a `manageNestedElements::<ownerId>::field:<handle>` authorization flag for the entry's Matrix/Address fields. Unlike the corresponding delete endpoint, actions/nested-elements/reorder trusts this session flag alone and never rechecks the caller's save permission for the owner element. As a result, a view-only user can POST to actions/nested-elements/reorder using the ownerElementType, ownerId, ownerSiteId, attribute, elementIds, and offset parameters present in the read-only page source and rewrite the sort order of Matrix blocks or Addresses belonging to content they are explicitly denied save access to.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/craftcms/cms/security/advisories/GHSA-6fp2-8j9w-7mj8
- https://www.vulncheck.com/advisories/craft-cms-5.0.0-before-5.10.13-broken-acces
FAQ
What is CVE-2026-92589?
CVE-2026-92589 is a vulnerability with a CVSS score of 4.3 (MEDIUM). Craft CMS 5.0.0 through 5.10.12 (fixed in 5.10.13) contains a broken access control flaw in the nested-elements reorder endpoint. When an authenticated control panel user with viewEntries and viewPeer...
How severe is CVE-2026-92589?
CVE-2026-92589 has been rated MEDIUM with a CVSS base score of 4.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-92589?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.