CVE-2026-84795: Craft CMS before 5.10.11 Authentication Bypass via Admin Flag Inheritance

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-02 · updated 2026-09-02
Weakness: CWE-269

Description

Craft CMS before 5.10.11 fails to validate the admin flag during user registration, allowing it to persist from deactivated admin accounts. Attackers can register with a deactivated admin's email address to inherit administrator privileges when public registration and disabled email verification are configured.

Affected products

craftcms cms: from 5.0.0-RC1 before 5.10.11 — fixed in 5.10.11

How to fix

Upgrade to a fixed version: craftcms cms 5.10.11. Check the vendor advisory for mitigations.

References

https://github.com/craftcms/cms/security/advisories/GHSA-242m-9wq7-vhwq
https://www.vulncheck.com/advisories/craft-cms-before-5.10.11-authentication-bypass-via-admin-flag-inheritance

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