Time-of-check Time-of-use (TOCTOU) Race Condition Affecting craftcms/cms package, versions >=4.5.0-RC1, <4.16.19>=5.0.0-RC1, <5.8.23
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published24 Feb 2026
- disclosed23 Feb 2026
- creditvitalysim VS
Introduced: 23 Feb 2026
NewCVE-2026-27128 (opens in a new tab)How to fix?
Upgrade craftcms/cms to version 4.16.19, 5.8.23 or higher.
Overview
craftcms/cms is a content management system.
Affected versions of this package are vulnerable to Time-of-check Time-of-use (TOCTOU) Race Condition via the getTokenRoute function. An attacker can bypass token usage limits by sending concurrent requests before the database update completes, allowing multiple uses of a single-use impersonation token. This is only exploitable if an attacker obtains a valid, non-expired impersonation token and can bypass any rate-limiting rules in place.