PYSEC-2026-4122 Open WebUI: Channel members can overwrite another member's message via the chat completions endpoint

Summary Any member of a channel who can post to it could also replace the text of a message written by a different member. The channel branch of the chat completions endpoint checked that the caller may write to the channel, and that the targeted message belongs to that channel, but never checked...

Open WebUI: Sign-in as another user via wildcard characters in the OAuth subject claim on SQLite

SummaryOn SQLite deployments, the lookup that maps an external identity to a local account does a substring match instead of an exact match. A subject value containing SQL wildcard characters therefore matches accounts the value was never issued for, and the sign-in binds to whichever account the...

Open WebUI: Inaccessible knowledge bases are exposed through the built-in knowledge tool on most vector backends

SummaryThe built-in knowledge search tool returns knowledge bases the calling user has no access to. The tool works out which knowledge bases the caller may read and hands that set to the vector store as a search filter, and that filter is the only access control on the path. Most of the shipped...

Open WebUI: Same-origin XSS to account takeover via terminal port-preview iframe hardcoding allow-same-origin

SummaryAny authenticated user with access to a shared terminal server could get script of their choosing to run in the Open WebUI origin itself. The in-app port preview rendered the content of a previewed port in an iframe whose sandbox always granted allow-same-origin alongside allow-scripts, an...

Open WebUI: Channel members can overwrite another member's message via the chat completions endpoint

SummaryAny member of a channel who can post to it could also replace the text of a message written by a different member. The channel branch of the chat completions endpoint checked that the caller may write to the channel, and that the targeted message belongs to that channel, but never checked...

Open WebUI: SSRF into internal services via DNS rebinding in the Playwright web loader

SummaryWith the Playwright web loader enabled, Open WebUI checks the address behind a user-submitted URL before allowing the request, then handed the request to the browser to perform. The browser resolved the hostname a second time, on its own, and that answer was never checked. An attacker who...

Open WebUI: Any authenticated user can inject chats into another user's folder via chat completions

SummaryThe chat-completions endpoint reads a folder id out of the request body and saves the newly created chat into that folder without checking that the caller is allowed to write there. Any authenticated user who knows a folder's id can put a chat of their own into another user's folder,...

Open WebUI: Users denied by the OAuth domain allowlist or role policy can still sign in via token exchange

SummaryOpen 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 account whose email domain the login callback would refuse could still obtain a working session through this...

Open WebUI: Non-admin users can delete admin-owned external knowledge connections via knowledge base deletion

SummaryExternal knowledge connections are created and owned by administrators, and are shared by every external knowledge base bound to them. Deleting an external knowledge base also removed that connection from the instance configuration, with no check on the caller's role and no check for other...

Open WebUI: Any authenticated user can reach the Azure platform channel via server-side web fetch

SummaryOpen WebUI fetches user-supplied URLs on the server for RAG URL ingestion and web search, and screens the resolved addresses so internal destinations cannot be reached. That screen decided whether a destination was external by asking Python's standard library whether the address is globall...

PYSEC-2026-4128 Open WebUI: Sign-in as another user via wildcard characters in the OAuth subject claim on SQLite

Summary On SQLite deployments, the lookup that maps an external identity to a local account does a substring match instead of an exact match. A subject value containing SQL wildcard characters therefore matches accounts the value was never issued for, and the sign-in binds to whichever account th...

PYSEC-2026-4125 Open WebUI: Inaccessible knowledge bases are exposed through the built-in knowledge tool on most vector backends

Summary The built-in knowledge search tool returns knowledge bases the calling user has no access to. The tool works out which knowledge bases the caller may read and hands that set to the vector store as a search filter, and that filter is the only access control on the path. Most of the shipped...

PYSEC-2026-4120 Open WebUI: SSRF into internal services via DNS rebinding in the Playwright web loader

Summary With the Playwright web loader enabled, Open WebUI checks the address behind a user-submitted URL before allowing the request, then handed the request to the browser to perform. The browser resolved the hostname a second time, on its own, and that answer was never checked. An attacker who...

PYSEC-2026-4118 Open WebUI: Any authenticated user can inject chats into another user's folder via chat completions

Summary The chat-completions endpoint reads a folder id out of the request body and saves the newly created chat into that folder without checking that the caller is allowed to write there. Any authenticated user who knows a folder's id can put a chat of their own into another user's folder,...

PYSEC-2026-4119 Open WebUI: Users denied by the OAuth domain allowlist or 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 applying the email domain allowlist that the normal OAuth login callback enforces. An account whose email domain the login callback would refuse could still obtain a working session through thi...

hubzoid (>=0.7.15, <=0.9.6), openwebui-token-tracking (0.1.7) potentially affected by CVE-2026-87999 via open-webui (>=0.6.0, <=0.11.0)

open-webui PYPI version =0.6.0, =0.7.15, =0.9.6 - openwebui-token-tracking 0.1.7 Source cves: CVE-2026-87999 Source advisory: OSV:PYSEC-2026-4116...

hubzoid (>=0.7.15, <=0.9.6) potentially affected by CVE-2026-87016 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-2026-87016 Source advisory: OSV:PYSEC-2026-4128...

hubzoid (>=0.7.15, <=0.9.6) potentially affected by CVE-2026-87017 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-2026-87017 Source advisory: OSV:PYSEC-2026-4125...

hubzoid (>=0.7.15, <=0.9.6) potentially affected by CVE-2026-87995 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-2026-87995 Source advisory: OSV:PYSEC-2026-4123...

hubzoid (>=0.7.15, <=0.9.6) potentially affected by CVE-2026-87994 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-2026-87994 Source advisory: OSV:PYSEC-2026-4122...