CVE-2026-112776: Craft CMS 5.0.0 before 5.11.0 GraphQL Site-Scope Bypass via Mutations

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-19 · updated 2026-10-20
Weakness: CWE-863

Description

Craft CMS from 5.0.0 before 5.11.0 contains an authorization bypass vulnerability that allows site-scoped GraphQL tokens to mutate other sites' content because requireAllowedSite() is not enforced. Attackers holding a site-A token can create entries in site B via supplied siteId and delete entries, categories, tags, and assets shared across sites.

Affected products

craftcms cms: from 5.0.0 before 5.11.0 — fixed in 5.11.0

How to fix

Upgrade to a fixed version: craftcms cms 5.11.0. Check the vendor advisory for mitigations.

References

https://github.com/craftcms/cms/security/advisories/GHSA-7rr3-4jcm-x526
https://www.vulncheck.com/advisories/craft-cms-5.0.0-before-5.11.0-graphql-site-scope-bypass-via-mutations

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