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CVE-2026-40479— Kimai: Stored XSS via Incomplete HTML Attribute Escaping in Team Member Widget

Quick assessment

Affected
kimai kimai
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.

kimai是kimai个人开发者的一个基于网络的多用户时间跟踪应用程序。 kimai 1.16.3至2.52.0版本存在安全漏洞，该漏洞源于escapeForHtml函数转义不完整，可能导致存储型跨站脚本攻击和权限提升。

CVSS 5.4 · Medium EPSS 0.25% · P15

Possible ATT&CK Techniques 1 AI

T1059.007 · JavaScript
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I. Basic Information for CVE-2026-40479

Vulnerability Information
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Vulnerability Title
Kimai: Stored XSS via Incomplete HTML Attribute Escaping in Team Member Widget
Source: CVE Program / CVE List V5
Vulnerability Description
Kimai is an open-source time tracking application. In versions 1.16.3 through 2.52.0, the escapeForHtml() function in KimaiEscape.js does not escape double quote or single quote characters. When a user's profile alias is inserted into an HTML attribute context via the team member form prototype and rendered through innerHTML, this incomplete escaping allows HTML attribute injection. An authenticated user with ROLE_USER privileges can store a malicious alias that executes JavaScript in the browser of any administrator viewing the team form, resulting in stored XSS with privilege escalation. This issue has been fixed in version 2.53.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
kimai 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
kimai是kimai个人开发者的一个基于网络的多用户时间跟踪应用程序。 kimai 1.16.3至2.52.0版本存在安全漏洞，该漏洞源于escapeForHtml函数转义不完整，可能导致存储型跨站脚本攻击和权限提升。
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
kimai kimai >= 1.16.3, < 2.53.0 -

II. Public POCs for CVE-2026-40479

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III. Intelligence Information for CVE-2026-40479

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Vendor Advisories for CVE-2026-40479 (1)

IV. Related Vulnerabilities

Same product: kimai
Same vendor: kimai
Same weakness: CWE-79

V. Comments for CVE-2026-40479

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