Open WebUI: Channel members can overwrite another member's message via the chat completions endpoint

SummaryAny member of a channel who can post to it could also replace the text of a message written by a different member. The channel branch of the chat completions endpoint checked that the caller may write to the channel, and that the targeted message belongs to that channel, but never checked...

GHSA-FMQH-XP37-5HR8 Open WebUI: Channel members can overwrite another member's message via the chat completions endpoint

Summary Any member of a channel who can post to it could also replace the text of a message written by a different member. The channel branch of the chat completions endpoint checked that the caller may write to the channel, and that the targeted message belongs to that channel, but never checked...

GHSA-3PF7-Q2G3-WJ28 Open WebUI: Any authenticated user can inject chats into another user's folder via chat completions

Summary The chat-completions endpoint reads a folder id out of the request body and saves the newly created chat into that folder without checking that the caller is allowed to write there. Any authenticated user who knows a folder's id can put a chat of their own into another user's folder,...

CVE-2026-43628 llama.cpp b3978–b9058 Integer Underflow via DRY Sampler

llama.cpp builds b3978 through b9058 contain an integer underflow and out-of-bounds read vulnerability in the DRY sampler that allows unauthenticated attackers to trigger a heap buffer underflow by sending a crafted HTTP request with dryallowedlength set to INT32MIN to the /v1/completions or...

CVE-2026-43628 llama.cpp b3978–b9058 Integer Underflow via DRY Sampler

llama.cpp builds b3978 through b9058 contain an integer underflow and out-of-bounds read vulnerability in the DRY sampler that allows unauthenticated attackers to trigger a heap buffer underflow by sending a crafted HTTP request with dryallowedlength set to INT32MIN to the /v1/completions or...

CVE-2026-15974 CVE-2026-15974

SGLang contains an SSRF and local file read in the multimodal generation endpoint /v1/chat/completions due to unsanitized imageurl, allowing access to internal metadata, secrets, and services...

Open WebUI: Authenticated users can bypass model access control via exposed query parameter [AI-ASSISTED]

SummaryAn internal-only bypassfilter parameter is exposed on the /openai/chat/completions and /ollama/api/chat HTTP endpoints via FastAPI query string binding, allowing any authenticated user to append ?bypassfilter=true and bypass model access control checks to invoke admin-restricted models...

vLLM vulnerable to DoS via large Chat Completion or Tokenization requests with specially crafted `chat_template_kwargs`

SummaryThe /v1/chat/completions and /tokenize endpoints allow a chattemplatekwargs request parameter that is used in the code before it is properly validated against the chat template. With the right chattemplatekwargs parameters, it is possible to block processing of the API server for long...

The vulnerability in the Open WebUI web interface, related to bypassing authentication using a user-controlled key, allows attackers to gain unauthorized access to protected information.

The vulnerability in the Open WebUI web interface relates to bypassing authentication using a key controlled by the user during the processing of the final endpoint /api/chat/completions. Exploiting this vulnerability could allow an attacker, operating remotely, to gain unauthorized access to...

CVE-2026-45401 Open WebUI: SSRF Bypass via HTTP Redirect Following in Web-Fetch and Image-Load Endpoints

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.5, the validateurl function in backend/openwebui/retrieval/web/utils.py only validates the initial URL submitted by the caller. The HTTP clients used downstream sync requests, async...

QuantumNous/new-api has an SSRF Filter Bypass via 0.0.0.0

SSRF Filter Bypass via 0.0.0.0 Summary The SSRF protection introduced in v0.9.0.5 CVE-2025-59146 and hardened in v0.9.6 CVE-2025-62155 does not block the unspecified address 0.0.0.0. A regular non-admin user holding any valid API token can send a multimodal request to /v1/chat/completions,...

CVE-2025-62426

A vulnerability in vLLM allows an authenticated user to trigger unintended tokenization during chat template processing by supplying crafted chattemplatekwargs to the /v1/chat/completions or /tokenize endpoints. By forcing the server to tokenize very large inputs, an attacker can block the API...

SQL Injection

Overview airda is an airda Affected versions of this package are vulnerable to SQL Injection via the execute function in the /v1/chat/completions file when processing the question argument. An attacker can access or modify sensitive data, or disrupt application functionality by sending crafted...

PT-2024-37739

Name of the Vulnerable Software and Affected Versions berriai/litellm version 1.38.10 Description A Server-Side Request Forgery SSRF vulnerability exists, allowing users to specify the api base parameter when making requests to POST /chat/completions. This causes the application to send the reque...