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

SummaryThe 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 by replacing colons with underscores documentid.replace":", "". An attacker can join a document room using not...

Open WebUI BOLA: `search_knowledge_files` Allows Unauthorized Knowledge Base File Enumeration

SummaryOpen 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...

PYSEC-2026-2712 Open WebUI: Any authenticated user can read other users' private notes via Socket.IO

Summary 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 by replacing colons with underscores documentid.replace":", "". An attacker can join a document room using no...

PYSEC-2026-2743 Open WebUI: SSRF Protection Bypass in Playwright Web Loader via HTTP Redirects

Summary The SafePlaywrightURLLoader implements a validateurl function to prevent SSRF attacks by checking the IP address of the user-provided URL. However, this validation is performed only on the initial URL. Since Playwright automatically follows HTTP redirects 301/302 by default, an attacker c...

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

SummarySeveral direct, index-addressed Ollama proxy routes accept a caller-supplied urlidxpath parameter and use it as a raw index into the admin-configured OLLAMABASEURLSlist. Access control on these routes validates only whether the user may use therequested model, never which backend the reque...

Open WebUI: SSRF Protection Bypass in Playwright Web Loader via HTTP Redirects

SummaryThe SafePlaywrightURLLoader implements a validateurl function to prevent SSRF attacks by checking the IP address of the user-provided URL. However, this validation is performed only on the initial URL.Since Playwright automatically follows HTTP redirects 301/302 by default, an attacker can...

PYSEC-2026-2766 Open WebUI: Cross-user file disclosure via /api/chat/completions image_url field

summary POST /api/chat/completions accepts an imageurl.url value that, when it does NOT start with http://, https://, or data:image/, is interpreted as a file id and resolved against the global file table with no ownership check. An authenticated user can therefore set imageurl.url to another...

PYSEC-2026-2761 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...

PYSEC-2026-2721 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...

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

SummaryOpen 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...

Open WebUI: Cross-user file disclosure via /api/chat/completions image_url field

summaryPOST /api/chat/completions accepts an imageurl.url value that, when it does NOT start with http://, https://, or data:image/, is interpreted as a file id and resolved against the global file table with no ownership check. An authenticated user can therefore set imageurl.url to another user...

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

SummaryA 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.Th...

Open WebUI Prompt history IDOR: unbound history_id allows cross-prompt read and deletion

SummaryOpen 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...

PYSEC-2026-2751 Open WebUI: Path traversal / SSRF in terminal server proxy via encoded path traversal

Summary 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 terminal server. An authenticated user who has been granted access to a terminal server can craft path values...

PYSEC-2026-2757 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...

PYSEC-2026-2763 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...

PYSEC-2026-2701 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...

PYSEC-2026-3401 vantage6 node has an Improper Access Control issue

Impact Malicious algorithms can potentially access other algorithms input and output files. Patches Todo Workarounds Verify and restrict the algorithm containers that are allowed to run on your node. See here on how to do this. References https://docs.vantage6.ai/usage/running-the-node/security F...

vantage6 node has an Improper Access Control issue

ImpactMalicious algorithms can potentially access other algorithms input and output files. PatchesTodo WorkaroundsVerify and restrict the algorithm containers that are allowed to run on your node. See here on how to do this. Referenceshttps://docs.vantage6.ai/usage/running-the-node/security For...

Dulwich has unbounded memory allocation in receive-pack from crafted thin packs

ImpactAn uncontrolled-resource-consumption memory exhaustion denial-of-service vulnerability CWE-400 / CWE-789.A client with push access could push a tiny crafted thin pack 174 bytes whose delta header declares a huge destsize. When dulwich ingested it via addthinpack / applydelta, it would...