EUVD-2026-81289
GHSA-mhr8-6rjx-8fjw
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network-reachable low-complexity request needs a low-privileged authenticated CP account (PR:L); impact is limited to reordering peer content, so I:L with C:N/A:N.
Primary rating from Vendor (vulncheck).
CVSS VectorVendor: vulncheck
Lifecycle Timeline
5DescriptionCVE.org
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.
AnalysisAI
Authenticated Craft CMS control-panel users holding viewEntries and viewPeerEntries (but not savePeerEntries) can silently reorder Matrix blocks and Addresses belonging to other authors' entries in Craft CMS 5.0.0 through 5.10.12 by POSTing directly to the actions/nested-elements/reorder endpoint. The flaw is a missing-authorization condition: the read-only entry view hands the session a manageNestedElements::<ownerId>::field:<handle> flag, and the reorder action trusts that flag without re-verifying the caller's save permission on the owner element, unlike the corresponding delete endpoint. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires an authenticated Craft control-panel account holding viewEntries and viewPeerEntries permissions but lacking savePeerEntries, in a deployment where multiple authors/users share entries (peer content). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine but low-severity broken-access-control flaw, not a high-CVSS priority. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade Craft CMS to 5.10.13 or later, the exact version that carries the vendor fix per the GitHub security advisory GHSA-6fp2-8j9w-7mj8 (https://github.com/craftcms/cms/security/advisories/GHSA-6fp2-8j9w-7mj8); this is the only complete remedy because the defect is a server-side missing authorization check that no client-side change can address. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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