CVE-2026-42530

NGINX Open Source has a vulnerability in the ngxhttpv3module module. When NGINX Open Source is configured to use the HTTP/3 QUIC module, a remote unauthenticated attacker along with conditions beyond their control can use a specially crafted HTTP/3 session to reopen a QPACK encoder stream. This m...

DEBIAN-CVE-2026-42530

NGINX Open Source has a vulnerability in the ngxhttpv3module module. When NGINX Open Source is configured to use the HTTP/3 QUIC module, a remote unauthenticated attacker along with conditions beyond their control can use a specially crafted HTTP/3 session to reopen a QPACK encoder stream. This m...

GHSA-CX9V-4QJ2-JRW6 Open WebUI BOLA: `search_knowledge_files` Allows Unauthorized Knowledge Base File Enumeration

Summary Open WebUI has a Broken Object Level Authorization BOLA vulnerability in the builtin searchknowledgefiles tool. When native function calling is enabled and the selected model has no attached knowledge bases, an authenticated user can call searchknowledgefiles with an arbitrary knowledgeid...

GHSA-4R4W-2WGP-W7CJ Open WebUI Prompt history IDOR: unbound history_id allows cross-prompt read and deletion

Summary Open WebUI's prompt version-history endpoints authorize the promptid in the URL but then act on caller-supplied history IDs without verifying that the history row belongs to that prompt historyentry.promptid == prompt.id. Three operations are affected: - GET...

Open WebUI: Sibling-Prefix Path Traversal via /cache/{path}

Summary A path traversal vulnerability exists in open-webui's cache file serving endpoint that allows any authenticated user to read files from sibling directories outside the intended cache directory, by exploiting an incomplete startswith containment check that lacks a trailing path separator...

GHSA-J2C8-V969-8R5C Open WebUI: Sibling-Prefix Path Traversal via /cache/{path}

Summary A path traversal vulnerability exists in open-webui's cache file serving endpoint that allows any authenticated user to read files from sibling directories outside the intended cache directory, by exploiting an incomplete startswith containment check that lacks a trailing path separator...

Open WebUI: Stored XSS to Account Takeover via Model Profile Images

Stored XSS to Account Takeover via Model Profile Images in Open WebUI Affected: Open WebUI tags. On the output side, users.py added a MIME allowlist check and X-Content-Type-Options: nosniff. The fix was applied to UserUpdateForm, UpdateProfileForm, and later to ChannelWebhookForm. Three models...

Protection Mechanism Failure

Overview open-webui is an Open WebUI Affected versions of this package are vulnerable to Protection Mechanism Failure via the profileimageurl field in the model metadata process. An attacker can execute arbitrary JavaScript in the context of another user's session by storing a crafted SVG payload...

GHSA-V2QM-5WXJ-QHJ7 Open WebUI: Stored XSS to Account Takeover via Model Profile Images

Stored XSS to Account Takeover via Model Profile Images in Open WebUI Affected: Open WebUI tags. On the output side, users.py added a MIME allowlist check and X-Content-Type-Options: nosniff. The fix was applied to UserUpdateForm, UpdateProfileForm, and later to ChannelWebhookForm. Three models...

Open WebUI: Forged model meta.knowledge allows cross-user file read and deletion

Summary Open WebUI lets a user who can create, update, or import workspace models store arbitrary meta.knowledge entries on their model without checking whether they own or can read the referenced files. Open WebUI then treats meta.knowledge entries of type file as an authorization source in two...

GHSA-V8QJ-HXV7-MGVV Open WebUI: Stored XSS in Mermaid Markdown Preview

Summary Open WebUI renders Mermaid blocks from Markdown files in the file preview panel and inserts the generated SVG into the DOM using innerHTML. Because Mermaid is configured with securityLevel: 'loose', attacker-controlled Mermaid content can be rendered unsafely in this flow. A working paylo...

Cross-site Scripting (XSS)

Overview open-webui is an Open WebUI Affected versions of this package are vulnerable to Cross-site Scripting XSS in the Markdown file preview process when rendering Mermaid blocks with a permissive security configuration. An attacker can execute arbitrary JavaScript in the context of the victim'...

Open WebUI: Stored XSS in Mermaid Markdown Preview

Summary Open WebUI renders Mermaid blocks from Markdown files in the file preview panel and inserts the generated SVG into the DOM using innerHTML. Because Mermaid is configured with securityLevel: 'loose', attacker-controlled Mermaid content can be rendered unsafely in this flow. A working paylo...

Open WebUI: Forged chat-file link allows cross-user file read and deletion

Summary Open WebUI v0.9.5 lets an authenticated user attach arbitrary fileid values to their own chat message without checking whether they own or can read those files. If the attacker then shares that chat and grants themselves read access, hasaccesstofile treats the victim file as accessible...

Missing Authorization

Overview open-webui is an Open WebUI Affected versions of this package are vulnerable to Missing Authorization through the improper authorization checks in the insertchatfiles process. An attacker can gain unauthorized access to and delete files belonging to other users by attaching arbitrary fil...

GHSA-VRHC-3FR6-PC3C Open WebUI: Forged chat-file link allows cross-user file read and deletion

Summary Open WebUI v0.9.5 lets an authenticated user attach arbitrary fileid values to their own chat message without checking whether they own or can read those files. If the attacker then shares that chat and grants themselves read access, hasaccesstofile treats the victim file as accessible...

Authorization Bypass Through User-Controlled Key

Overview open-webui is an Open WebUI Affected versions of this package are vulnerable to Authorization Bypass Through User-Controlled Key via the getimagebase64fromurl function. An attacker can access files belonging to other users by supplying a file identifier in the imageurl.url field that doe...

GHSA-226F-F24G-524W Open WebUI: Redirect-Bypass SSRF in OAuth `_process_picture_url` (incomplete-fix sibling of CVE-2026-45401)

Summary backend/openwebui/utils/oauth.py::processpictureurl v0.9.5, lines 1435-1470 calls validateurlpictureurl on the initial URL only, then invokes aiohttp.ClientSession.getpictureurl, ... without allowredirects=False. aiohttp's default is allowredirects=True, maxredirects=10; the function does...

Server-side Request Forgery (SSRF)

Overview open-webui is an Open WebUI Affected versions of this package are vulnerable to Server-side Request Forgery SSRF in the processpictureurl function. An attacker can access internal network resources and exfiltrate sensitive data by submitting a crafted OAuth profile image URL that redirec...

GHSA-3VV5-8XXP-4F55 Open WebUI: Cross-origin postMessage confirmation bypass via action:submit

Summary The chat message listener allows non-same-origin input:prompt and action:submit messages, so an external site can set prompt text and trigger submitPrompt in an authenticated victim session. I validated this with a cross-origin attacker page that auto-posted messages and caused unauthoriz...