CVE-2026-92589 Craft CMS 5.0.0 before 5.10.13 Broken Access Control via nested-elements/reorder
Authenticated view-only users can modify Matrix block sort order in Craft CMS due to missing save permission checks on the reorder endpoint.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-92589?
CVE-2026-92589 is a medium-severity missing authorization vulnerability in craftcms cms, published on 16 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-862
Which versions are affected by CVE-2026-92589?
How do I fix CVE-2026-92589?
No fix has been published for CVE-2026-92589 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-92589 being exploited?
There is no known exploitation of CVE-2026-92589 in the wild and no public exploit code.
Sources
Also known as GHSA-6fp2-8j9w-7mj8, GHSA-mhr8-6rjx-8fjw.