Authorization Bypass in Craft CMS by Pixel & Tonic
CVE-2026-112776

9.3CRITICAL

Key Information:

Vendor

Craftcms

Status
Cms
Vendor
CVE Published:
19 October 2026

What is CVE-2026-112776?

Craft CMS versions before 5.11.0 are susceptible to an authorization bypass vulnerability that allows unauthorized manipulation of site content via GraphQL tokens. Because the requireAllowedSite() function isn't properly enforced, an attacker with a valid site-A token can exploit this flaw to perform mutations on content belonging to site B, including the deletion and creation of entries, categories, tags, and shared assets. This vulnerability poses a significant risk to data integrity across multiple sites managed within the same instance.

Affected Version(s)

cms 5.0.0 < 5.11.0

cms 5.11.0

References

https://github.com/craftcms/cms/security/advisories/GHSA-...
vendor-advisory
https://www.vulncheck.com/advisories/craft-cms-5.0.0-befo...
third-party-advisory

CVSS V4

Score:
9.3
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.