Impersonation token reuse via non-atomic usage enforcement
Published Feb 24, 2026 · Updated Feb 24, 2026
TOCTOU in Craft CMS 4.5.0-RC1 through 4.16.18 and 5.0.0-RC1 through 5.8.22 allows remote attackers to reuse limited-use tokens. The getTokenRoute() method checks usageCount and then increments or deletes the token in separate database operations without mutual exclusion. A valid unexpired impersonation URL and concurrent requests that evade rate limits are required; a higher-privileged token enables privilege escalation.
Summary
What happened
TOCTOU in Craft CMS 4.5.0-RC1 through 4.16.18 and 5.0.0-RC1 through 5.8.22 allows remote attackers to reuse limited-use tokens. The getTokenRoute() method checks usageCount and then increments or deletes the token in separate database operations without mutual exclusion. A valid unexpired impersonation URL and concurrent requests that evade rate limits are required; a higher-privileged token enables privilege escalation.
The record
- CVE
- CVE-2026-27128
- Published
- Feb 24, 2026
- Updated
- Feb 24, 2026
- Vendor
- Pixel & Tonic
- Product
- Craft CMS
- Classifications
- CWE-367
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Feb 24, 2026CVE publishedPublication date reported by the CVE source.
- Feb 24, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=>= 4.5.0-RC1, < 4.16.19
- Affected versionversion=>= 5.0.0-RC1, < 5.8.23
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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