TI-2026-29230 Aliases CVE-2026-40479 GHSA-g82g-m9vx-vhjg

Kimai: Stored XSS via Incomplete HTML Attribute Escaping in Team Member Widget

MEDIUM 58CWE-79Published 2026-04-17 · Updated 2026-04-20

Key facts

Attack vector: Network
Privileges required: Low
User interaction: Required
Attack complexity: Low
Impact type: Cross-site scripting
Confidentiality · integrity · availability: Low · Low · None
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-79.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00207 10th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Fixed kimai (kimai): 2.53.0kimai/kimai (Packagist): 2.53.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
kimai	kimai	1.16.3 to before 2.53.0	2.53.0	Patch available	CNA
—	kimai/kimai (Packagist)	before 2.53.0	2.53.0	Patch available	GHSA-g82g-m9vx-vhjg

kimai Vendorkimai Affected 1.16.3 to before 2.53.0 Fixed in 2.53.0 Patch available CNA
kimai/kimai (Packagist) Vendor— Affected before 2.53.0 Fixed in 2.53.0 Patch available GHSA-g82g-m9vx-vhjg

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:kimai:kimai::::::::	before 2.53.0	Vulnerable	kimai

cpe:2.3:a:kimai:kimai:*:*:*:*:*:*:*:* Versions before 2.53.0 Vulnerable ·kimai

Remediation

Fix · CNA kimai (kimai) Fixed in 2.53.0
Fix · GHSA-g82g-m9vx-vhjg kimai/kimai (Packagist) Fixed in 2.53.0 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-40479
2026-10-03 Alias added: GHSA-g82g-m9vx-vhjg

References

Exploit 1

https://github.com/kimai/kimai/security/advisories/GHSA-g82g-m9vx-vhjg

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2026-40479

Other 3

TI-2023-30240 Kimai 1.30.10 SameSite Cookie Vulnerability Session Hijacking CVSS 4.0HIGH 8.5
TI-2026-22900 Kimai: API invoice endpoint missing customer-level access control (IDOR) CVSS 3.1MEDIUM 6.5
TI-2026-30580 Kimai: Formula Injection via tag names in XLSX export CVSS 4.0MEDIUM 5.4
TI-2019-15371 Kimai 2- persistent cross-site scripting (XSS) CVSS 4.0MEDIUM 5.1
TI-2026-29237 Kimai's User Preferences API allows standard users to modify restricted attributes: hourly_rate, internal_rate CVSS 3.1MEDIUM 4.3
TI-2026-30084 Kimai: Team API Missing Object-Level Authorization CVSS 3.1LOW 3.3

See all 13 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences