GHSA-PWXH-7358-JQ2X Open WebUI: Stored XSS via unescaped KaTeX render-error fallback in rendered messages

Summary Any authenticated user can store a chat message whose math block makes KaTeX fail with a stack overflow instead of a parse error. When that happens the renderer falls back to inserting the original math source into the page as HTML rather than as text, so script in the message runs in the...

Cross-site Scripting (XSS)

Overview open-webui is an Open WebUI Affected versions of this package are vulnerable to Cross-site Scripting XSS via the KatexRenderer process in the message rendering component. An attacker can execute arbitrary scripts in the browser of any user who views a crafted message by embedding malicio...

EUVD-2026-52923

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.10.0 until 0.11.0, src/lib/components/chat/Messages/Markdown/KatexRenderer.svelte could store and render a chat message whose math block makes KaTeX fail with a stack overflow instead of a parse error. Th...

CVE-2026-70492

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.10.0 until 0.11.0, src/lib/components/chat/Messages/Markdown/KatexRenderer.svelte could store and render a chat message whose math block makes KaTeX fail with a stack overflow instead of a parse error. Th...

CVE-2026-70492 Open WebUI: Stored XSS via unescaped KaTeX render-error fallback in rendered messages

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.10.0 until 0.11.0, src/lib/components/chat/Messages/Markdown/KatexRenderer.svelte could store and render a chat message whose math block makes KaTeX fail with a stack overflow instead of a parse error. Th...

CVE-2026-70492 Open WebUI: Stored XSS via unescaped KaTeX render-error fallback in rendered messages

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.10.0 until 0.11.0, src/lib/components/chat/Messages/Markdown/KatexRenderer.svelte could store and render a chat message whose math block makes KaTeX fail with a stack overflow instead of a parse error. Th...

CVE-2026-70492

Open WebUI had a stored XSS vulnerability in KaTeX render-fallback: between 0.10.0 and 0.11.0, KaTeX errors could be rendered via HTML (via {@html}) in rendered messages, allowing script execution in viewers’ browsers and risking session token theft and potential admin account takeovers. Affected...

Information Exposure

Overview open-webui is an Open WebUI Affected versions of this package are vulnerable to Information Exposure via the GET /api/v1/tools/, GET /api/v1/tools/list, and GET /api/v1/tools/id/id endpoints. An attacker can access sensitive source code and potentially embedded secrets by making...

CVE-2026-70491 Open WebUI: Tool source code disclosed to read-only users via the tool list and get endpoints

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. In 0.10.2 and earlier, the GET /api/v1/tools/, GET /api/v1/tools/list, and GET /api/v1/tools/id/id endpoints in backend/openwebui/routers/tools.py returned full Python tool source to authenticated non-admin...

CVE-2026-70491 Open WebUI: Tool source code disclosed to read-only users via the tool list and get endpoints

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. In 0.10.2 and earlier, the GET /api/v1/tools/, GET /api/v1/tools/list, and GET /api/v1/tools/id/id endpoints in backend/openwebui/routers/tools.py returned full Python tool source to authenticated non-admin...

CVE-2026-70491

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. In 0.10.2 and earlier, the GET /api/v1/tools/, GET /api/v1/tools/list, and GET /api/v1/tools/id/id endpoints in backend/openwebui/routers/tools.py returned full Python tool source to authenticated non-admin...

EUVD-2026-52922

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. In 0.10.2 and earlier, the GET /api/v1/tools/, GET /api/v1/tools/list, and GET /api/v1/tools/id/id endpoints in backend/openwebui/routers/tools.py returned full Python tool source to authenticated non-admin...

CVE-2026-70491

Open WebUI vulnerability CVE-2026-70491 affects the self-hosted Open WebUI platform. In versions up to 0.10.2, the GET endpoints /api/v1/tools/, /api/v1/tools/list, and /api/v1/tools/id/{id} exposed full Python tool source to authenticated non-admin read-only users due to the interaction between ...

CVE-2026-70491 Open WebUI: Tool source code disclosed to read-only users via the tool list and get endpoints

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. In 0.10.2 and earlier, the GET /api/v1/tools/, GET /api/v1/tools/list, and GET /api/v1/tools/id/id endpoints in backend/openwebui/routers/tools.py returned full Python tool source to authenticated non-admin...

Incorrect Authorization

Overview open-webui is an Open WebUI Affected versions of this package are vulnerable to Incorrect Authorization via the /resolveauthenticatedconnection process. An attacker can gain unauthorized interactive terminal access by using a valid, unexpired JWT for an account with insufficient approval...

EUVD-2026-52918

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.8.8 until 0.11.0, the terminal WebSocket route in backend/openwebui/routers/terminals.py authenticated its own first-message JWT and never applied the verified-user role gate that getverifieduser enforces...

CVE-2026-70490 Open WebUI: Unapproved accounts can open terminal sessions via a WebSocket auth path missing the role check

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.8.8 until 0.11.0, the terminal WebSocket route in backend/openwebui/routers/terminals.py authenticated its own first-message JWT and never applied the verified-user role gate that getverifieduser enforces...

Regular Expression Denial of Service (ReDoS)

Overview open-webui is an Open WebUI Affected versions of this package are vulnerable to Regular Expression Denial of Service ReDoS through the automation recurrence rule process. An attacker can cause the application to become unresponsive and deny service to all users by submitting specially...

Open WebUI: Instance-wide stall via automation recurrence rules that force multi-second parsing

Summary In every affected release, automation recurrence parsing anchors minutely and hourly rules at a fixed date of 2000-01-01 and then walks forward one interval at a time to find the next run. A single FREQ=MINUTELY rule therefore enumerates roughly a quarter-century of occurrences,...

CVE-2026-70489

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.9.0 until 0.11.0, automation recurrence parsing in backend/openwebui/utils/automations.py anchored minutely and hourly rules at a fixed date of 2000-01-01 and then walked forward one interval at a time to...