EUVD-2026-66605
GHSA-j399-mfvr-j893
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network-delivered crafted URL requires no privileges; victim must actively click and authenticate (UI:R); JWT and identity fully disclosed with account-level API control (C:H/I:H); no availability impact.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
3DescriptionCVE.org
OpenMetadata accepts a caller-supplied post-authentication redirect target and appends the issued token to it. SamlLoginServlet reads the callback request parameter and stores it in the HTTP session without comparing it against any configured or registered destination, and the assertion consumer servlet later formats that stored value into a URL carrying the freshly issued JWT together with the account's email and name before sending the redirect. The OIDC and OAuth2 handler follows the same pattern with its own redirect parameter and the issued identity token. A request naming a destination the attacker controls therefore causes the server to deliver a valid token for whoever completes the login to that destination. Because the token authenticates API calls as that account, a user who follows such a link and authenticates hands over control of their account. Version 2.0.0 removes the caller-supplied callback parameter; no 1.x release validates it.
AnalysisAI
JWT token disclosure in OpenMetadata's SAML and OIDC/OAuth2 authentication flows enables account takeover by exploiting an unvalidated open redirect that appends the victim's freshly issued JWT, email, and account name to an attacker-controlled URL. All 1.x releases are affected because neither SamlLoginServlet nor the OIDC/OAuth2 handler validates the caller-supplied redirect destination against any allowlist or registered callback set. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The victim must follow an attacker-crafted OpenMetadata login URL that contains a manipulated `callback` (SAML flow) or equivalent redirect parameter (OIDC/OAuth2 flow) pointing to an attacker-controlled destination. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:N) scores 8.5, correctly reflecting network reachability, low complexity, no privilege requirement, mandatory active user interaction, and high confidentiality plus integrity impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker registers a server at attacker.example.com and crafts an OpenMetadata login URL with the `callback` parameter set to https://attacker.example.com/capture, then delivers this link to a targeted employee via a phishing email. The employee clicks the link, is prompted to authenticate via their corporate SAML IdP, and upon successful login OpenMetadata's assertion consumer servlet redirects their browser to https://attacker.example.com/capture?token=<JWT>&email=victim@corp.com&name=Jane+Doe. … |
| Remediation | The definitive fix is upgrading to OpenMetadata 2.0.0, which eliminates the vulnerability by removing the caller-supplied callback parameter from the SAML and OIDC/OAuth2 authentication flows entirely rather than attempting allowlist validation. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, audit all OpenMetadata 1.x deployments to identify systems using SAML or OIDC/OAuth2 authentication and examine authentication logs for suspicious redirect parameters. …
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