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Vulnerability details: VCID-ukq9-ggdc-byf5
Vulnerability ID VCID-ukq9-ggdc-byf5
Aliases CVE-2026-27128
GHSA-6fx5-5cw5-4897
Summary Craft CMS Race condition in Token Service potentially allows for token usage greater than the token limit 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.
Status Published
Exploitability 0.5
Weighted Severity 6.2
Risk 3.1
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
epss 7e-05 https://api.first.org/data/v1/epss?cve=CVE-2026-27128
cvssv3.1_qr MODERATE https://github.com/advisories/GHSA-6fx5-5cw5-4897
cvssv4 6.9 https://github.com/craftcms/cms
generic_textual MODERATE https://github.com/craftcms/cms
cvssv4 6.9 https://github.com/craftcms/cms/commit/3e4afe18279951c024c64896aa2b93cda6d95fdf
generic_textual MODERATE https://github.com/craftcms/cms/commit/3e4afe18279951c024c64896aa2b93cda6d95fdf
ssvc Track https://github.com/craftcms/cms/commit/3e4afe18279951c024c64896aa2b93cda6d95fdf
cvssv3.1_qr MODERATE https://github.com/craftcms/cms/security/advisories/GHSA-6fx5-5cw5-4897
cvssv4 6.9 https://github.com/craftcms/cms/security/advisories/GHSA-6fx5-5cw5-4897
generic_textual MODERATE https://github.com/craftcms/cms/security/advisories/GHSA-6fx5-5cw5-4897
ssvc Track https://github.com/craftcms/cms/security/advisories/GHSA-6fx5-5cw5-4897
cvssv4 6.9 https://nvd.nist.gov/vuln/detail/CVE-2026-27128
generic_textual MODERATE https://nvd.nist.gov/vuln/detail/CVE-2026-27128
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2026-27128
https://github.com/craftcms/cms
https://github.com/craftcms/cms/commit/3e4afe18279951c024c64896aa2b93cda6d95fdf
CVE-2026-27128 https://nvd.nist.gov/vuln/detail/CVE-2026-27128
GHSA-6fx5-5cw5-4897 https://github.com/advisories/GHSA-6fx5-5cw5-4897
GHSA-6fx5-5cw5-4897 https://github.com/craftcms/cms/security/advisories/GHSA-6fx5-5cw5-4897
No exploits are available.
Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N Found at https://github.com/craftcms/cms
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N Found at https://github.com/craftcms/cms/commit/3e4afe18279951c024c64896aa2b93cda6d95fdf
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-02-28T02:13:24Z/ Found at https://github.com/craftcms/cms/commit/3e4afe18279951c024c64896aa2b93cda6d95fdf
Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N Found at https://github.com/craftcms/cms/security/advisories/GHSA-6fx5-5cw5-4897
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

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physical

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Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-02-28T02:13:24Z/ Found at https://github.com/craftcms/cms/security/advisories/GHSA-6fx5-5cw5-4897
Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N Found at https://nvd.nist.gov/vuln/detail/CVE-2026-27128
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

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Exploit Prediction Scoring System (EPSS)
Percentile 0.0063
EPSS Score 7e-05
Published At May 30, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-05-30T21:06:46.193335+00:00 GitLab Importer Import https://gitlab.com/gitlab-org/advisories-community/-/blob/main/packagist/craftcms/cms/CVE-2026-27128.yml 38.6.0