Vulnerability · Published Sep 2, 2026 · Assigned by Hackrate
CVE-2026-79990GQL entry mutation `siteId` bypasses schema site scope, enabling cross-site content read/write/delete
High 8.7
In plain English
A high-severity authorization bypass via user-controlled key in cms from craftcms. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 39% of all known vulnerabilities).
Official 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.
Affected products (as reported)
Weakness: CWE-639 · 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
References
- https://www.hckrt.com/hacktivity/HCKRT-XEQKMX third-party-advisory, technical-description, mitigation
- https://github.com/craftcms/cms/releases/tag/5.10.11 release-notes
- https://github.com/craftcms/cms product
- https://github.com/craftcms/cms/security/advisories/GHSA-3wcr-p33w-528f third-party-advisory