Open WebUI /oauth/backchannel-logout DoS

The vulnerability of the /oauth/backchannel-logout web interface component in the Open WebUI system is related to asymmetric resource consumption. Exploiting this vulnerability could allow a malicious actor to cause service failure remotely...

CVE-2026-88006: Incorrect Authorization

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.8.0 until 0.11.1, 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...

PT-2026-89454

Name of the Vulnerable Software and Affected Versions Open WebUI versions 0.8.0 through 0.11.0 Description The OAuth token exchange endpoint in backend/open webui/routers/auths.py issues a session for a provider access token without executing the OAuth role management checks performed by the...

PT-2026-89453

Name of the Vulnerable Software and Affected Versions Open WebUI versions 0.8.0 through 0.8.9 Description The OAuth token exchange endpoint in backend/open webui/routers/auths.py fails to apply the email domain allowlist that is normally enforced during the OAuth login callback. This occurs becau...

PT-2026-89703

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...

CVE-2026-88005: Incorrect Authorization

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.8.0 until 0.9.0, Open WebUI's OAuth token exchange endpoint issues a session for a provider access token without applying the email domain allowlist that the normal OAuth login callback enforces. An accou...

Open WebUI: Any authenticated user can hang the server via message deletion in a cyclic chat tree

Summary Chat histories are stored as an unvalidated JSON object. After a message is deleted, the code that picks the chat's new current message walked down the childrenIds links without recording where it had already been. Any account with the default user role could store a chat whose messages...

hubzoid (>=0.7.15, <=0.9.6) potentially affected by CVE-2026-88000 via open-webui (0.11.0)

open-webui PYPI version 0.11.0 is affected by a known vulnerability. The following packages have a transitive dependency on open-webui and may be impacted: - hubzoid =0.7.15, =0.9.6 Source cves: CVE-2026-88000 Source advisory: OSV:GHSA-3CGP-3CQX-J8W2...

hubzoid (>=0.7.15, <=0.9.6) potentially affected by CVE-2026-88000 via open-webui (0.11.0)

open-webui PYPI version 0.11.0 is affected by a known vulnerability. The following packages have a transitive dependency on open-webui and may be impacted: - hubzoid =0.7.15, =0.9.6 Source cves: CVE-2026-88000 Source advisory: SNYK:PYTHON-OPENWEBUI-20158688...

hubzoid (>=0.7.15, <=0.9.6) potentially affected by CVE-2026-88000 via open-webui (0.11.0)

open-webui PYPI version 0.11.0 is affected by a known vulnerability. The following packages have a transitive dependency on open-webui and may be impacted: - hubzoid =0.7.15, =0.9.6 Source cves: CVE-2026-88000 Source advisory: GHSA-3CGP-3CQX-J8W2...

EUVD-2026-75185

Open WebUI: Any authenticated user can hang the server via message deletion in a cyclic chat tree...

GHSA-3CGP-3CQX-J8W2 Open WebUI: Any authenticated user can hang the server via message deletion in a cyclic chat tree

Summary Chat histories are stored as an unvalidated JSON object. After a message is deleted, the code that picks the chat's new current message walked down the childrenIds links without recording where it had already been. Any account with the default user role could store a chat whose messages...

Infinite loop

Overview open-webui is an Open WebUI Affected versions of this package are vulnerable to Infinite loop through the chat-history message deletion helper process. An attacker can cause the server to hang and deny service to all users by creating a cyclic chat tree and deleting a message, resulting ...

Open WebUI: Server-side fetches reach blocked and internal hosts via unvalidated HTTP redirect targets

Summary Open WebUI protects server-side web fetches with two controls: the operator's list of excluded hosts, and a check that refuses private and internal addresses. Neither control was applied to the destination of an HTTP redirect. On a deployment where redirect following is enabled, any...

hubzoid (>=0.7.15, <=0.9.6) potentially affected by CVE-2026-88001 via open-webui (0.11.0)

open-webui PYPI version 0.11.0 is affected by a known vulnerability. The following packages have a transitive dependency on open-webui and may be impacted: - hubzoid =0.7.15, =0.9.6 Source cves: CVE-2026-88001 Source advisory: GHSA-5X7X-4C3C-QF5W...

hubzoid (>=0.7.15, <=0.9.6) potentially affected by CVE-2026-88001 via open-webui (0.11.0)

open-webui PYPI version 0.11.0 is affected by a known vulnerability. The following packages have a transitive dependency on open-webui and may be impacted: - hubzoid =0.7.15, =0.9.6 Source cves: CVE-2026-88001 Source advisory: SNYK:PYTHON-OPENWEBUI-20158687...

EUVD-2026-75187

Open WebUI: Server-side fetches reach blocked and internal hosts via unvalidated HTTP redirect targets...

GHSA-5X7X-4C3C-QF5W Open WebUI: Server-side fetches reach blocked and internal hosts via unvalidated HTTP redirect targets

Summary Open WebUI protects server-side web fetches with two controls: the operator's list of excluded hosts, and a check that refuses private and internal addresses. Neither control was applied to the destination of an HTTP redirect. On a deployment where redirect following is enabled, any...

hubzoid (>=0.7.15, <=0.9.6) potentially affected by CVE-2026-88001 via open-webui (0.11.0)

open-webui PYPI version 0.11.0 is affected by a known vulnerability. The following packages have a transitive dependency on open-webui and may be impacted: - hubzoid =0.7.15, =0.9.6 Source cves: CVE-2026-88001 Source advisory: OSV:GHSA-5X7X-4C3C-QF5W...

Server-side Request Forgery (SSRF)

Overview open-webui is an Open WebUI Affected versions of this package are vulnerable to Server-side Request Forgery SSRF in the fetch process when HTTP redirects are followed and the destination of the redirect is not validated against excluded hosts or private/internal address checks. An attack...