CVE-2026-84795

CRITICAL 9.8

Craft CMS before 5.10.11 Authentication Bypass via Admin Flag Inheritance

CVSS Score

9.8

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-269
Vendor	craftcms
Product	cms
Published	Sep 2, 2026
Last Updated	Sep 2, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

craftcms / cms

5.0.0-RC1 < 5.10.11

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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