---
id: CVE-2026-80200
title: >-
  Kimai before 2.53.0 contains an open redirect vulnerability in the SAML
  authentication success handler that accepts unvalidated RelayState POST
  parameters as redirect destinations
summary: >-
  Kimai before 2.53.0 contains an open redirect vulnerability in the SAML
  authentication success handler that accepts unvalidated RelayState POST
  parameters as redirect destinations. Attackers with IdP access can supply
  malicious RelayStat…
severity: medium
cvss: 4.7
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N'
cwe:
  - CWE-601
vendor: kimai
product: kimai
affected:
  - kimai < 2.53.0
published: '2026-08-26'
updated: '2026-10-08'
sourceUpdated: '2026-10-08T16:17:45.977'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-80200'
references:
  - url: 'https://github.com/kimai/kimai/security/advisories/GHSA-3jp4-mhh4-gcgr'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/kimai-before-2.53.0-open-redirect-via-relaystate
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-08-26T15:58:54.494666Z'
epss: 0.0036
epssPercentile: 0.27684
ingestedAt: '2026-10-08T16:52:14.730Z'
---

## Overview

Kimai before 2.53.0 contains an open redirect vulnerability in the SAML authentication success handler that accepts unvalidated RelayState POST parameters as redirect destinations. Attackers with IdP access can supply malicious RelayState values to redirect authenticated users to attacker-controlled URLs for credential theft or phishing attacks.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.