CVE-2026-54021

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.6, several direct, index-addressed Ollama proxy routes accept a caller-supplied urlidx path parameter and use it as a raw index into the admin-configured OLLAMABASEURLS list. Access...

CVE-2026-54021

Summary: Open WebUI prior to 0.9.6 allows any authenticated user to direct requests to arbitrary Ollama backends by appending a caller-supplied url_idx, bypassing backend-level isolation and possibly reaching restricted or disabled backends. The issue arises on index-addressed Ollama proxy routes...

CVE-2026-54021 Open WebUI: Authenticated users can target arbitrary configured Ollama backends via unguarded url_idx path parameter

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.6, several direct, index-addressed Ollama proxy routes accept a caller-supplied urlidx path parameter and use it as a raw index into the admin-configured OLLAMABASEURLS list. Access...

CVE-2026-54021 Open WebUI: Authenticated users can target arbitrary configured Ollama backends via unguarded url_idx path parameter

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.6, several direct, index-addressed Ollama proxy routes accept a caller-supplied urlidx path parameter and use it as a raw index into the admin-configured OLLAMABASEURLS list. Access...

CVE-2026-54022 Open WebUI: Any authenticated user can read other users' private notes via Socket.IO

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.8.11, the ydoc:document:join Socket.IO handler checks note ownership only when the documentid starts with note: colon. However, the YdocManager storage layer normalizes all document IDs b...

CVE-2026-54022

Summary (grounded in provided sources): Open WebUI prior to version 0.8.11 has a logic bug in the ydoc:document:join handler: authorization is only enforced for document IDs starting with the prefix note:. The YdocManager stores documents using a normalized key where colons are replaced with unde...

CVE-2026-54017

Open WebUI vulnerability CVE-2026-54017 affects the terminal-server proxy in backend/open_webui/routers/terminals.py before version 0.9.6. An authenticated non-admin user can craft the request path to perform traversal and SSRF to the terminal server and potentially internal services. Two vectors...

CVE-2026-54017 Open WebUI: Path traversal / SSRF in terminal server proxy via encoded path traversal

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.6, the terminal-server reverse proxy in backend/openwebui/routers/terminals.py does not fully confine the user-controlled path segment before forwarding it to an admin-configured termin...

CVE-2026-55205

Hermes WebUI prior to 0.51.468 is affected by a resource-exhaustion vulnerability in the unauthenticated POST /api/onboarding/oauth/start endpoint. The issue allows unbounded accumulation of in-memory flow state and daemon threads, enabling repeated or concurrent requests to exhaust server memory...

EUVD-2026-37904

Hermes WebUI before 0.51.468 contains a resource exhaustion vulnerability in the unauthenticated POST /api/onboarding/oauth/start endpoint that allows unbounded accumulation of in-memory flow state and daemon threads. Attackers can send repeated or concurrent requests to exhaust server memory and...

CVE-2026-55205 Hermes WebUI < 0.51.468 - Resource Exhaustion via Unauthenticated OAuth Flow Endpoint

Hermes WebUI before 0.51.468 contains a resource exhaustion vulnerability in the unauthenticated POST /api/onboarding/oauth/start endpoint that allows unbounded accumulation of in-memory flow state and daemon threads. Attackers can send repeated or concurrent requests to exhaust server memory and...

CVE-2026-55205 Hermes WebUI < 0.51.468 - Resource Exhaustion via Unauthenticated OAuth Flow Endpoint

Hermes WebUI before 0.51.468 contains a resource exhaustion vulnerability in the unauthenticated POST /api/onboarding/oauth/start endpoint that allows unbounded accumulation of in-memory flow state and daemon threads. Attackers can send repeated or concurrent requests to exhaust server memory and...

CVE-2026-55196

Hermes WebUI before 0.51.409 contains an authentication bypass vulnerability in passkey registration endpoints that allows unauthenticated remote attackers to register arbitrary passkeys. When HERMESWEBUIPASSKEY=1 is enabled with no existing credentials, POST /api/auth/passkey/register/options an...

CVE-2026-55197

Hermes WebUI before 0.51.443 contains a broken access control vulnerability in the /api/session endpoint that allows authenticated users to disclose cross-profile session transcripts. Attackers can bypass profile boundary checks by directly querying session IDs belonging to other profiles via GET...

CVE-2026-55198

Hermes WebUI before 0.51.443 contains an authorization bypass vulnerability in the session export endpoint that allows authenticated users to access sessions from other profiles. The handlesessionexport handler in api/routes.py fails to verify active-profile ownership before serializing session...

Incorrect Authorization

Overview open-webui is an Open WebUI Affected versions of this package are vulnerable to Incorrect Authorization through the getollamaurl process. An attacker can gain unauthorized access to restricted backend resources by supplying a crafted urlidx path parameter to route requests to internal or...

CVE-2026-55198 Hermes WebUI < 0.51.443 - Cross-Profile Session Data Exfiltration via Session Export Endpoint

Hermes WebUI before 0.51.443 contains an authorization bypass vulnerability in the session export endpoint that allows authenticated users to access sessions from other profiles. The handlesessionexport handler in api/routes.py fails to verify active-profile ownership before serializing session...

CVE-2026-55198

Hermes WebUI prior to 0.51.443 contains an authorization bypass in the session export endpoint. The _handle_session_export handler in api/routes.py fails to verify active-profile ownership before serializing session data, allowing authenticated users to exfiltrate transcripts from other profiles ...

CVE-2026-55197 Hermes WebUI < 0.51.443 - Broken Access Control in /api/session Endpoint

Hermes WebUI before 0.51.443 contains a broken access control vulnerability in the /api/session endpoint that allows authenticated users to disclose cross-profile session transcripts. Attackers can bypass profile boundary checks by directly querying session IDs belonging to other profiles via GET...

CVE-2026-55197 Hermes WebUI < 0.51.443 - Broken Access Control in /api/session Endpoint

Hermes WebUI before 0.51.443 contains a broken access control vulnerability in the /api/session endpoint that allows authenticated users to disclose cross-profile session transcripts. Attackers can bypass profile boundary checks by directly querying session IDs belonging to other profiles via GET...