# CVE-2026-80200: Kimai open redirect in SAML authentication handler

Source: https://junglewise.ai/threats/cve-2026-80200-kimai-open-redirect-in-saml-authentication-handler  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-08-26. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-80200 · Severity: medium · CVSS 4.7 · Published 2026-08-26

Kimai is a time-tracking and project management web application that supports SAML-based single sign-on authentication. An attacker with access to a SAML identity provider can craft a malicious redirect that sends authenticated users to an attacker-controlled website after they log in, enabling credential theft or phishing attacks. This requires the victim to initiate login through an IdP-initiated SSO flow and the attacker to have control over the SAML identity provider configuration.

Technologies: [Kimai](https://junglewise.ai/threats/technologies/kimai), [kimai/kimai (Packagist)](https://junglewise.ai/threats/technologies/kimai-kimai). Vendors: [Kimai](https://junglewise.ai/threats/vendors/kimai), [Packagist](https://junglewise.ai/threats/vendors/packagist).

## Quick answers

**Is CVE-2026-80200 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-80200 being exploited in the wild.

**How severe is CVE-2026-80200?** Medium severity, with a CVSS score of 4.7, published 26 August 2026.

**Which products and versions are affected?** Kimai before 2.53.0; kimai/kimai (Packagist) ECOSYSTEM:introduced=0,fixed=2.53.0.

**Is there a fix for CVE-2026-80200?** Yes. kimai/kimai (Packagist): upgrade to 2.53.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-80200 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-80200?** Check whether you run Kimai or kimai/kimai (Packagist) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- kimai/kimai (Packagist): upgrade to 2.53.0 or later

  ```sh
  composer require kimai/kimai:^2.53.0
  ```


## Technical details

The vulnerability is an open redirect (CWE-601) in the SAML authentication success handler (src/Saml/Security/SamlAuthenticationSuccessHandler.php) where the RelayState POST parameter is accepted as a redirect destination without validating the host or scheme. The vulnerable code only checks that RelayState does not equal the configured login_path, allowing any external URL to be used as a redirect target. An attacker with IdP access can supply a malicious RelayState value in an IdP-initiated SSO flow to redirect users post-authentication. The vulnerability was patched in version 2.53.0, which validates RelayState to ensure it contains no host/port, does not start with //, and if it contains a host, that host matches the current request host.

## Affected products

- Kimai Kimai before 2.53.0

## Identifiers

- CVE-2026-80200
- GHSA-3jp4-mhh4-gcgr

## Timeline

- 2026-04-11: disclosed
- 2026-04-11: patched: Fixed in version 2.53.0
- 2026-08-26: advisory

## References

- [https://github.com/kimai/kimai/security/advisories/GHSA-3jp4-mhh4-gcgr](https://github.com/kimai/kimai/security/advisories/GHSA-3jp4-mhh4-gcgr)
- [https://www.vulncheck.com/advisories/kimai-before-2.53.0-open-redirect-via-relaystate](https://www.vulncheck.com/advisories/kimai-before-2.53.0-open-redirect-via-relaystate)

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