GHSA-WVM9-9G5J-623F Open WebUI: Users denied by the OAuth role policy can still sign in via token exchange

Summary Open WebUI's OAuth token exchange endpoint issues a session for a provider access token without running the OAuth role management that the normal OAuth login callback runs. A user whose provider roles the login callback would refuse, or would demote, could still obtain a working session a...

Open WebUI: Unauthenticated requests can stall the server via uncached OIDC fetches in back-channel logout

Summary The OIDC back-channel logout endpoint is unauthenticated by design, because the identity provider calls it without a browser session. Before checking whether the submitted logout token was genuine, the handler fetched the provider's discovery document and its signing keys over the network...

EUVD-2026-75170

Open WebUI: Unauthenticated requests can stall the server via uncached OIDC fetches in back-channel logout...

GHSA-3G9Q-V48F-HH9W Open WebUI: Unauthenticated requests can stall the server via uncached OIDC fetches in back-channel logout

Summary The OIDC back-channel logout endpoint is unauthenticated by design, because the identity provider calls it without a browser session. Before checking whether the submitted logout token was genuine, the handler fetched the provider's discovery document and its signing keys over the network...

Allocation of Resources Without Limits or Throttling

Overview open-webui is an Open WebUI Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling through the POST /oauth/backchannel-logout process in the OIDC back-channel logout handler when unauthenticated requests trigger repeated network fetches f...

Open WebUI: Any authenticated user can suppress calendar alerts instance-wide via a non-numeric alert value

Any authenticated user can suppress calendar alerts instance-wide via a non-numeric alert value Summary Calendar events carry a free-form meta object that is stored exactly as submitted, with no validation of the values inside it. The scheduler reads the per-event alert offset out of that object ...

EUVD-2026-75171

Open WebUI: Any authenticated user can suppress calendar alerts instance-wide via a non-numeric alert value...

Improper Validation of Specified Type of Input

Overview open-webui is an Open WebUI Affected versions of this package are vulnerable to Improper Validation of Specified Type of Input via the meta object in calendar events, which is stored without validation. An attacker can disrupt calendar alert functionality for all users by submitting a...

GHSA-V39V-59XW-J98G Open WebUI: Any authenticated user can suppress calendar alerts instance-wide via a non-numeric alert value

Any authenticated user can suppress calendar alerts instance-wide via a non-numeric alert value Summary Calendar events carry a free-form meta object that is stored exactly as submitted, with no validation of the values inside it. The scheduler reads the per-event alert offset out of that object ...

Open WebUI: Any authenticated user can start a non-terminating request via a folder parent cycle

Summary Any authenticated user can move one of their own folders under itself, leaving a loop in their folder tree. The re-parent endpoint performed no check that the new parent was not the folder itself or one of its own subfolders, and the folder tree walks did not track which folders they had...

EUVD-2026-75172

Open WebUI: Any authenticated user can start a non-terminating request via a folder parent cycle...

Infinite loop

Overview open-webui is an Open WebUI Affected versions of this package are vulnerable to Infinite loop through the POST /api/v1/folders/id/update/parent handler, which allows a folder to be moved under itself or one of its subfolders, creating a cycle in the folder hierarchy. An attacker can caus...

GHSA-8R35-5X5R-HV74 Open WebUI: Any authenticated user can start a non-terminating request via a folder parent cycle

Summary Any authenticated user can move one of their own folders under itself, leaving a loop in their folder tree. The re-parent endpoint performed no check that the new parent was not the folder itself or one of its own subfolders, and the folder tree walks did not track which folders they had...

Open WebUI: Admin demoted through SSO role sync keeps read and write access to all users' notes

Summary A user who is demoted from admin by an identity provider keeps admin-level read and write access to every user's notes, over any Socket.IO connection that was already open when the demotion happened. Open WebUI caches the user's role on the socket at connection time, and the two SSO...

EUVD-2026-75173

Open WebUI: Admin demoted through SSO role sync keeps read and write access to all users' notes...

Incorrect Authorization

Overview open-webui is an Open WebUI Affected versions of this package are vulnerable to Incorrect Authorization through the caching of user roles on active Socket.IO connections during SSO-driven role changes. An attacker can retain unauthorized read and write access to other users' private note...

GHSA-WJWR-XFP9-R66P Open WebUI: Admin demoted through SSO role sync keeps read and write access to all users' notes

Summary A user who is demoted from admin by an identity provider keeps admin-level read and write access to every user's notes, over any Socket.IO connection that was already open when the demotion happened. Open WebUI caches the user's role on the socket at connection time, and the two SSO...

CVE-2026-87015

creationtimestamp| type| source ---|---|--- 2026-09-10 22:35:03+00:00| published-proof-of-concept| https://github.com/open-webui/open-webui/security/advisories/GHSA-p78m-89r6-pgf7...

CVE-2026-19646

IBM Common Licensing Agent 9.0, Agent 9.0.0.1, Agent 9.0.0.2, ART 9.0, ART 9.0.0.1, and ART 9.0.0.2 could allow a remote attacker to redirect users to an arbitrary domain due to improper validation of the HTTP Host header...

CVE-2026-19646 Multiple vulnerabilities affect IBM License Key Server Administration and Reporting Tool and IBM LKS Administration Agent

IBM Common Licensing Agent 9.0, Agent 9.0.0.1, Agent 9.0.0.2, ART 9.0, ART 9.0.0.1, and ART 9.0.0.2 could allow a remote attacker to redirect users to an arbitrary domain due to improper validation of the HTTP Host header...