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...

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-2026-59217: 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-2026-58123: Missing Authentication for Critical Function

Hermes WebUI before 0.51.788 contains an unauthenticated remote code execution vulnerability that allows remote attackers to execute arbitrary shell commands by accessing the embedded terminal API endpoints without credentials. Attackers can create a session, attach a PTY shell, and write arbitra...

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...

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-2026-59218: Observable 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...

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...

PT-2026-56827

Name of the Vulnerable Software and Affected Versions Open WebUI versions prior to 0.10.0 Description Open WebUI runs client-side Python using Pyodide a Python distribution for the browser within a same-origin web worker. This allows stored chat payloads to utilize pyodide.http.pyfetch, the js...

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...

PT-2026-56882

Name of the Vulnerable Software and Affected Versions Open WebUI versions prior to 0.10.0 Description Authenticated users can execute Python code or tools within another user's session. This occurs because the get event call function delivers execute:python and execute:tool Socket.IO events to a...

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...

CVE-2026-59213: Use of Cache Containing Sensitive Information

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.6.27 before 0.10.0, getallmodels handlers in routers/openai.py and routers/ollama.py passed a lambda to aiocache key instead of keybuilder, causing permission-filtered per-user model lists to share a stat...

CVE-2026-59219: Insufficient Session Expiration

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.9.0 before 0.10.0 with Redis configured, Socket.IO connect, user-join, join-channels, join-note, and the terminal websocket first-message authentication used decodetoken without the Redis-backed...

CVE-2026-59222: Exposure of Sensitive Information to an Unauthorized Actor

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.7.0 before 0.10.0, GET /api/v1/channels//members returned full UserModelResponse objects for channel members, including settings.ui.toolServers.key and webhook configuration, allowing a normal channel...

CVE-2026-59220: Inefficient Regular Expression Complexity

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.9.2 before 0.10.0, the SKILLMENTIONRE and stripre regular expressions in backend/openwebui/utils/middleware.py parsed skill mentions with overlapping quantifiers, allowing an authenticated chat message...

CVE-2026-59225: Missing Authorization

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.8.12 before 0.10.0, an authenticated non-admin user with read access to an arena wrapper model can reach a restricted underlying model through task endpoints such as /api/v1/tasks/moa/completions. The...

CVE-2026-59226: Improper Authorization

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.9.0 before 0.10.0, executeautomation rehydrated automation owners without rechecking that they were still active or still had features.automations, and checkmodelaccess only enforced private-model grants...

CVE-2026-59227: Missing Authorization

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.8.11 before 0.10.0, POST /api/v1/images/edit required only a verified account and did not enforce the global image-edit switch or the per-user image-generation permission, allowing a non-admin user to...

PT-2026-56829

Name of the Vulnerable Software and Affected Versions Open WebUI versions 0.9.2 through 0.9.x Description An issue exists in the SKILL MENTION RE and strip re regular expressions within the backend/open webui/utils/middleware.py file. These expressions parse skill mentions in the format using...