Open Redirect in Kimai (CVE-2026-80200)
Summary
Vulnerability in Kimai (CVE-2026-80200). Risk of unauthorized operations or information disclosure.
Original description
The description as published by the source.
Summary
The SAML authentication success handler in Kimai returns the RelayState POST parameter as a redirect destination without validating the host or scheme. After a user successfully authenticates via SAML, they are redirected to an attacker-controlled URL if the IdP includes a malicious RelayState value. This enables phishing attacks that steal credentials or session tokens post-SSO.
Requires SAML to be enabled (non-default configuration).
Details
Vulnerable file: src/Saml/Security/SamlAuthenticationSuccessHandler.php
// Line 27-33
$relayState = $request->request->get('RelayState', $request->query->get('RelayState'));
if (\is_scalar($relayState)) {
$relayState = (string) $relayState;
if ($relayState !== $this->httpUtils->generateUri($request, (string) $this->options['login_path'])) {
return $relayState; // No host/scheme validation — any URL accepted
}
}
The only check is that RelayState does not equal the configured login_path. Any external URL (e.g., https://attacker.com) passes this check and is returned as the redirect destination.
The existing unit test SamlAuthenticationSuccessHandlerTest::testRelayState() confirms this behavior — an absolute URL in RelayState results in a redirect to that URL with no restriction.
Steps to Reproduce
1. Enable SAML authentication in Kimai
2. Configure a SAML IdP (e.g., SimpleSAMLphp)
3. Initiate IdP-initiated SSO with RelayState=https://attacker.com
— or in…
Source: GitHub Security Advisories (Global) NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-80200 has been found in Kimai.
Risk of unauthorized operations or information disclosure. CVSS score: 4.7/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "Kimai CVE-2026-80200" on the vendor's site.
CVE-2026-80200 (Kimai) — CWE-601 / CVSS v3 4.7
Attack vector: remote (network-reachable) / unauthenticated
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-601) exists in Kimai.
Check the vendor advisory for the affected versions of Kimai.
Severity: Medium (CVSS 4.7/10). Risk of unauthorized operations or information disclosure.
Update to the patched release per vendor advisory.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'Kimai' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r 'Kimai' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
Kimaiを grep し、稼働しているサービス・バージョンを把握する。 -
2Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
References
- package github.com
- web github.com
- web nvd.nist.gov
- web disclosure@vulncheck.com
- web github.com
- web github.com