CVE-2026-59218 Open WebUI: Account enumeration via observable login timing discrepancy

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. Prior to 0.10.0, the /api/v1/auths/signin endpoint looked users up by email and only ran bcrypt password verification when a credential existed, making registered-account attempts measurably slower than...

CVE-2026-59218 Open WebUI: Account enumeration via observable login timing discrepancy

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. Prior to 0.10.0, the /api/v1/auths/signin endpoint looked users up by email and only ran bcrypt password verification when a credential existed, making registered-account attempts measurably slower than...

CVE-2026-59218 Open WebUI: Account enumeration via observable login timing discrepancy

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. Prior to 0.10.0, the /api/v1/auths/signin endpoint looked users up by email and only ran bcrypt password verification when a credential existed, making registered-account attempts measurably slower than...

CVE-2026-59214

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. Prior to 0.10.0, Open WebUI runs client-side Python with Pyodide in a same-origin web worker, allowing stored chat payloads that use pyodide.http.pyfetch or the js module fetch and XMLHttpRequest APIs to issue...

CVE-2026-59214

Open WebUI (self-hosted AI platform) is affected by a vulnerability described as a stored web worker XSS via Pyodide. Prior to version 0.10.0, the platform runs client-side Python with Pyodide inside a same-origin web worker, which could allow stored chat payloads using pyodide.http.pyfetch or th...

CVE-2026-59214 Open WebUI: Stored web worker XSS via Pyodide

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. Prior to 0.10.0, Open WebUI runs client-side Python with Pyodide in a same-origin web worker, allowing stored chat payloads that use pyodide.http.pyfetch or the js module fetch and XMLHttpRequest APIs to issue...

CVE-2026-59214 Open WebUI: Stored web worker XSS via Pyodide

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. Prior to 0.10.0, Open WebUI runs client-side Python with Pyodide in a same-origin web worker, allowing stored chat payloads that use pyodide.http.pyfetch or the js module fetch and XMLHttpRequest APIs to issue...

CVE-2026-59214 Open WebUI: Stored web worker XSS via Pyodide

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. Prior to 0.10.0, Open WebUI runs client-side Python with Pyodide in a same-origin web worker, allowing stored chat payloads that use pyodide.http.pyfetch or the js module fetch and XMLHttpRequest APIs to issue...

PT-2026-56881

Name of the Vulnerable Software and Affected Versions Open WebUI versions prior to 0.10.0 Description An issue exists in the channel thread parent and reply handling where the parent id is not bound to the channel in the URL. This allows an authenticated user to reference a message from a differe...

CVE-2026-59215: Authorization Bypass Through User-Controlled Key

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. Prior to 0.10.0, channel thread parent and reply handling did not bind parentid to the channel in the URL, allowing an authenticated user to reference a message from another private or DM channel and disclose...

PT-2026-56888

Name of the Vulnerable Software and Affected Versions Open WebUI versions 0.8.12 through 0.9.x Description An authenticated non-admin user with read access to an arena wrapper model can access a restricted underlying model. This occurs because task endpoints, such as...

PT-2026-56832

Name of the Vulnerable Software and Affected Versions Open WebUI versions 0.6.16 through 0.9.x Description The Socket.IO server is configured with always connect=True, which allows the ydoc:awareness:update and ydoc:document:leave Socket.IO handlers to accept collaborative-document events without...

PT-2026-56989

Name of the Vulnerable Software and Affected Versions Hermes WebUI versions prior to 0.51.788 Description An unauthenticated remote code execution issue allows remote attackers to execute arbitrary shell commands. This is achieved by accessing embedded terminal API endpoints without credentials...

CVE-2026-59217: Missing Authorization

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. Prior to 0.10.0, the file upload path accepted metadata.knowledgeid and auto-linked uploaded files to a target knowledge base without applying the write-access check used by /api/v1/knowledge//file/add, allowing...

CVE-2026-59223: Protection Mechanism Failure

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. Prior to 0.10.0, WEBFETCHFILTERLIST matching compared configured host entries against URL strings and non-label-boundary suffixes, allowing path-based blocklist bypasses such as !internal.example.com in a URL pa...

CVE-2026-59224: Improper Authentication

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. Prior to 0.10.0, backend/openwebui/routers/terminals.py built the wsterminal upstream URL from an unencoded sessionid and appended userid as a query parameter, allowing query injection to make the terminal backe...

PT-2026-56883

Name of the Vulnerable Software and Affected Versions Open WebUI versions prior to 0.10.0 Description The file upload path fails to apply the necessary write-access checks when the metadata.knowledge id variable is provided. This allows users with read-only permissions to bypass the security...

CVE-2026-58122: Use of Less Trusted Source

Hermes WebUI before 0.51.307 contains an authentication bypass vulnerability that allows unauthenticated remote attackers to circumvent local-origin IP restrictions on onboarding endpoints by supplying a spoofed X-Forwarded-For header with a loopback address. Attackers can exploit this bypass to...

CVE-2026-59212: Incorrect Authorization

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.9.6 before 0.10.0, verifyknowledgefileaccess only checked read access while file write and delete routes later trusted object-derived access through writable model meta.knowledge entries, allowing a user...

PT-2026-56831

Name of the Vulnerable Software and Affected Versions Open WebUI versions 0.8.11 through 0.9.x Description An issue exists where the 'POST /api/v1/images/edit' endpoint only requires a verified account and fails to enforce the global image-edit switch or per-user image-generation permissions. Thi...