CVE-2026-54025

LibreChat suffers a stored XSS in its Markdown artifact preview prior to version 0.8.4-rc1. The vulnerability arises because lib re uses marked v15.0.12 to render image alt text without HTML-escaping double quotes when the custom image renderer defers to the default renderer. LibreChat’s generate...

CVE-2026-54027 LibreChat: Image Upload Route Bypasses Agent Permission Check — Incomplete Fix for File Upload Authorization

LibreChat is an enhanced ChatGPT clone that supports multiple AI providers. Prior to 0.8.4-rc1, the POST /api/files/images endpoint allows any authenticated user to upload files into any agent's toolresources e.g., context, executecode without verifying ownership or EDIT permission on the target...

CVE-2026-54027

LibreChat is an enhanced ChatGPT clone that supports multiple AI providers. Prior to 0.8.4-rc1, the POST /api/files/images endpoint allows any authenticated user to upload files into any agent's toolresources e.g., context, executecode without verifying ownership or EDIT permission on the target...

CVE-2026-54027

Vulnerability (CVE-2026-54027): LibreChat prior to 0.8.4-rc1 allows authenticated users to upload files via POST /api/files/images into any agent’s tool_resources (e.g., context, execute_code) without ownership/EDIT checks. A permission check was added to POST /api/files, but the image upload rou...

CVE-2026-54027 LibreChat: Image Upload Route Bypasses Agent Permission Check — Incomplete Fix for File Upload Authorization

LibreChat is an enhanced ChatGPT clone that supports multiple AI providers. Prior to 0.8.4-rc1, the POST /api/files/images endpoint allows any authenticated user to upload files into any agent's toolresources e.g., context, executecode without verifying ownership or EDIT permission on the target...

CVE-2026-54029 LibreChat: IDOR in Message Deletion — Incomplete Fix for CVE-2024-41703 Leaves deleteMessages() Without User Filter

LibreChat is an enhanced ChatGPT clone that supports multiple AI providers. Prior to 0.8.4-rc1, the DELETE /api/messages/:conversationId/:messageId endpoint allows any authenticated user to delete any other user's messages. The validateMessageReq middleware only validates that the conversationId...

CVE-2026-54029 LibreChat: IDOR in Message Deletion — Incomplete Fix for CVE-2024-41703 Leaves deleteMessages() Without User Filter

LibreChat is an enhanced ChatGPT clone that supports multiple AI providers. Prior to 0.8.4-rc1, the DELETE /api/messages/:conversationId/:messageId endpoint allows any authenticated user to delete any other user's messages. The validateMessageReq middleware only validates that the conversationId...

CVE-2026-54029

CVE-2026-54029 affects LibreChat prior to 0.8.4-rc1. The bug is in the DELETE /api/messages/:conversationId/:messageId endpoint where authentication validates the conversationId but the deleteMessages({ messageId }) call uses only messageId as the MongoDB filter, omitting a user constraint. As a ...

CVE-2026-54029 LibreChat: IDOR in Message Deletion — Incomplete Fix for CVE-2024-41703 Leaves deleteMessages() Without User Filter

LibreChat is an enhanced ChatGPT clone that supports multiple AI providers. Prior to 0.8.4-rc1, the DELETE /api/messages/:conversationId/:messageId endpoint allows any authenticated user to delete any other user's messages. The validateMessageReq middleware only validates that the conversationId...

EUVD-2026-39460

LibreChat is an enhanced ChatGPT clone that supports multiple AI providers. Prior to 0.8.4-rc1, LibreChat allows users to configure custom OpenAI-compatible API endpoints by setting a baseURL. This URL is used to construct HTTP requests without any SSRF validation — no private IP check, no scheme...

CVE-2026-54033

LibreChat exposes an SSRF risk in its baseURL handling: prior to version 0.8.4-rc1, an authenticated user could set a custom OpenAI-compatible API endpoint baseURL and have requests constructed without SSRF validation (no private IP check, no scheme restriction, no DNS pinning). This allowed dire...

CVE-2026-54033 LibreChat: SSRF via User-Provided Custom Endpoint baseURL — no private IP validation on user-configured API base URLs

LibreChat is an enhanced ChatGPT clone that supports multiple AI providers. Prior to 0.8.4-rc1, LibreChat allows users to configure custom OpenAI-compatible API endpoints by setting a baseURL. This URL is used to construct HTTP requests without any SSRF validation — no private IP check, no scheme...

CVE-2026-54037 LibreChat: Incomplete Fix for CVE-2025-7105 — /api/convos/duplicate Lacks Rate Limiting Applied to /api/convos/fork

LibreChat is an enhanced ChatGPT clone that supports multiple AI providers. Prior to 0.8.4-rc1, the fix for CVE-2025-7105 added forkIpLimiter and forkUserLimiter rate limiters to POST /api/convos/fork to prevent rapid-fire conversation duplication. However, the POST /api/convos/duplicate endpoint...

CVE-2026-54037

LibreChat is an enhanced ChatGPT clone that supports multiple AI providers. Prior to 0.8.4-rc1, the fix for CVE-2025-7105 added forkIpLimiter and forkUserLimiter rate limiters to POST /api/convos/fork to prevent rapid-fire conversation duplication. However, the POST /api/convos/duplicate endpoint...

EUVD-2026-39458

LibreChat is an enhanced ChatGPT clone that supports multiple AI providers. Prior to 0.8.4-rc1, the fix for CVE-2025-7105 added forkIpLimiter and forkUserLimiter rate limiters to POST /api/convos/fork to prevent rapid-fire conversation duplication. However, the POST /api/convos/duplicate endpoint...

CVE-2026-54037

LibreChat (a multi-provider ChatGPT-like app) contains a missing rate limiter in POST /api/convos/duplicate, which performs the same expensive DB operations as POST /api/convos/fork. The fix for CVE-2025-7105 added forkIpLimiter and forkUserLimiter to /fork, but did not apply a corresponding limi...

CVE-2026-54037 LibreChat: Incomplete Fix for CVE-2025-7105 — /api/convos/duplicate Lacks Rate Limiting Applied to /api/convos/fork

LibreChat is an enhanced ChatGPT clone that supports multiple AI providers. Prior to 0.8.4-rc1, the fix for CVE-2025-7105 added forkIpLimiter and forkUserLimiter rate limiters to POST /api/convos/fork to prevent rapid-fire conversation duplication. However, the POST /api/convos/duplicate endpoint...

CVE-2026-54030

CVE-2026-54030 affects LibreChat (MCP OAuth flow). Before v0.8.5, the OAuth Protected Resource metadata’s resource parameter is not validated against the MCP server URL, enabling a malicious MCP server to steal access tokens intended for a legitimate server. Affected version range includes pre-0....

CVE-2026-54030

LibreChat is an enhanced ChatGPT clone that supports multiple AI providers. Prior to 0.8.5, LibreChat's MCP OAuth implementation does not validate that the resource parameter from OAuth Protected Resource metadata RFC 9728 matches the configured MCP server URL, allowing a malicious MCP server to...

CVE-2026-54030 LibreChat: Missing Resource Parameter Validation in MCP OAuth Flow

LibreChat is an enhanced ChatGPT clone that supports multiple AI providers. Prior to 0.8.5, LibreChat's MCP OAuth implementation does not validate that the resource parameter from OAuth Protected Resource metadata RFC 9728 matches the configured MCP server URL, allowing a malicious MCP server to...