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CVE-2026-27128— Craft CMS's race condition in Token Service potentially allows for token usage greater than the token limit

Quick assessment

Affected
craftcms cms
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Craft CMS是Craft CMS开源的一套内容管理系统（CMS）。 Craft CMS 4.5.0-RC1版本至4.16.18版本和5.0.0-RC1版本至5.8.22版本存在安全漏洞，该漏洞源于令牌验证服务存在TOCTOU竞争条件，可能导致单次使用令牌被多次使用。

AI Predicted 7.5 Difficulty: Hard EPSS 0.21% · P10

Possible ATT&CK Techniques 1 AI

T1136.003 · Cloud Account
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I. Basic Information for CVE-2026-27128

Vulnerability Information
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Vulnerability Title
Craft CMS's race condition in Token Service potentially allows for token usage greater than the token limit
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
检查时间与使用时间(TOCTOU)的竞争条件
Source: CVE Program / CVE List V5
Vulnerability Title
Craft CMS 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Craft CMS是Craft CMS开源的一套内容管理系统（CMS）。 Craft CMS 4.5.0-RC1版本至4.16.18版本和5.0.0-RC1版本至5.8.22版本存在安全漏洞，该漏洞源于令牌验证服务存在TOCTOU竞争条件，可能导致单次使用令牌被多次使用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
craftcms cms >= 4.5.0-RC1, < 4.16.19 -

II. Public POCs for CVE-2026-27128

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III. Intelligence Information for CVE-2026-27128

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Same Patch Batch · craftcms · 2026-02-24 · 4 CVEs total

CVE-2026-27127 Craft CMS has Cloud Metadata SSRF Protection Bypass via DNS Rebinding
CVE-2026-27129 Cloud Metadata SSRF Protection Bypass via IPv6 Resolution
CVE-2026-27126 Craft CMS has Stored XSS in Table Field via "HTML" Column Type

IV. Related Vulnerabilities

Same product: cms
Same vendor: craftcms
Same weakness: CWE-367

V. Comments for CVE-2026-27128

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