Craft is a content management system (CMS). In versions 4.5.0-RC1 through 4.16.18 and 5.0.0-RC1 through 5.8.22, a Time-of-Check-Time-of-Use (TOCTOU) race condition exists in Craft CMS’s token validation service for tokens that explicitly set a limited usage. The `getTokenRoute()` method reads a token’s usage count, checks if it’s within limits, then updates the database in separate non-atomic operations. By sending concurrent requests, an attacker can use a single-use impersonation token multiple times before the database update completes. To make this work, an attacker needs to obtain a valid user account impersonation URL with a non-expired token via some other means and exploit a race condition while bypassing any rate-limiting rules in place. For this to be a privilege escalation, the impersonation URL must include a token for a user account with more permissions than the current user. Versions 4.16.19 and 5.8.23 patch the issue.
References
| Link | Resource |
|---|---|
| https://github.com/craftcms/cms/commit/3e4afe18279951c024c64896aa2b93cda6d95fdf | Patch |
| https://github.com/craftcms/cms/security/advisories/GHSA-6fx5-5cw5-4897 | Third Party Advisory |
Configurations
Configuration 1 (hide)
|
History
No history.
Information
Published : 2026-02-24 03:16
Updated : 2026-02-27 20:06
NVD link : CVE-2026-27128
Mitre link : CVE-2026-27128
CVE.ORG link : CVE-2026-27128
JSON object : View
Products Affected
craftcms
- craft_cms
CWE
CWE-367
Time-of-check Time-of-use (TOCTOU) Race Condition