Craft CMS GraphQL entry mutation resolvers (saveEntry, deleteEntry) read siteIddirectly from$argumentswithout passing throughArgumentManagerprepareArguments(), which is the function that enforces site-scope filtering via array_intersect against the GraphQL schema’s allowed sites. The query path (ElementResolverprepareElementQuery) correctly calls prepareArguments()`, so queries to unauthorized sites return empty. But mutations bypass this entirely — an attacker with a token scoped to Site A can create, modify, or delete entries in Site B by passing siteId in the mutations argument.
History

Wed, 02 Sep 2026 21:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Wed, 02 Sep 2026 10:45:00 +0000

Type Values Removed Values Added
Description Craft CMS GraphQL entry mutation resolvers (saveEntry, deleteEntry) read siteIddirectly from$argumentswithout passing throughArgumentManagerprepareArguments(), which is the function that enforces site-scope filtering via array_intersect against the GraphQL schema’s allowed sites. The query path (ElementResolverprepareElementQuery) correctly calls prepareArguments()`, so queries to unauthorized sites return empty. But mutations bypass this entirely — an attacker with a token scoped to Site A can create, modify, or delete entries in Site B by passing siteId in the mutations argument.
Title GQL entry mutation `siteId` bypasses schema site scope, enabling cross-site content read/write/delete
First Time appeared Craftcms
Craftcms cms
Weaknesses CWE-639
CPEs cpe:2.3:a:craftcms:cms:*:*:*:*:*:*:*:*
Vendors & Products Craftcms
Craftcms cms
References
Metrics cvssV4_0

{'score': 8.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: Hackrate

Published: 2026-09-02T14:19:54.892Z

Updated: 2026-09-02T17:53:23.468Z

Reserved: 2026-08-25T16:39:03.171Z

Link: CVE-2026-79990

cve-icon Vulnrichment

Updated: 2026-09-02T17:53:19.869Z

cve-icon NVD

Status : Deferred

Published: 2026-09-02T15:17:42.473

Modified: 2026-09-03T17:45:20.840

Link: CVE-2026-79990

cve-icon Redhat

No data.