CVE-2026-81029 OpenMetadata before 2.0.0 JWT Disclosure via Unvalidated SAML and OIDC Redirect URI
Attackers can steal JWT tokens via unvalidated redirect URIs in SAML/OIDC flows, leading to account takeover and data access.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-81029?
CVE-2026-81029 is a high-severity vulnerability in open-metadata OpenMetadata, published on 26 Aug 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
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.
Weakness: CWE-601
Which versions are affected by CVE-2026-81029?
How do I fix CVE-2026-81029?
No fix has been published for CVE-2026-81029 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-81029 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-81029 exists.
Sources
Also known as GHSA-3f34-r7gw-5f28, GHSA-j399-mfvr-j893.