LibreChat/api/server/controllers
Dustin Healy 90b2d7a1ab fix(mcp): harden sandbox security and fix stale closures, error states
Addresses security and correctness findings from a second review pass.

Sandbox hardening: trustedOrigin is now derived from document.referrer at
startup so notifyReady uses the known parent origin instead of the wildcard
'*'. toDomainList validates every entry against a strict host-pattern regex
before joining, preventing CSP injection via malicious server metadata.
serveMCPSandbox now sets Content-Security-Policy: frame-ancestors 'self' and
X-Frame-Options: SAMEORIGIN so the sandbox proxy cannot be framed by
third-party origins.

Server-side guards: appToolCall now validates that toolName is actually
registered on serverName before forwarding to tools/call. The
knownToolNamesCache is populated alongside modelOnlyToolCache in
populateToolCaches, scoped per user/server key. isModelOnlyTool was inlined
into appToolCall now that the single caching pass populates both sets.
readResource gained the updateUserLastActivity call so resource fetches also
prevent idle timeout. 500 responses now return generic messages; McpError
InvalidRequest (-32600) surfaces as 400 with the message.

Client: useAppBridge uses refs for onSizeChanged, toolArgs, and toolResult so
the stable bridge effect closure always reads current values without
triggering a remount. MCPAppView tracks timedOut separately from loaded so a
bridge failure after 10 s shows an error message instead of a blank iframe.
Added com_ui_mcp_app_failed_to_load translation key. Redundant
as string | undefined casts on toolName removed in ToolCall, MCPUIResource,
and UIResourceCarousel.
2026-06-23 18:35:27 -07:00
..
__tests__ 🔐 fix: Honor Admin-Panel MCP Allowlist Overrides Without Restart (#13814) 2026-06-17 20:14:53 -04:00
agents 🖇️ feat: Reference Selected Chat Text with Multi-Quote Popup (#13868) 2026-06-21 08:33:11 -04:00
assistants 🔐 feat: Add Signed CloudFront File Downloads (#12970) 2026-05-06 19:48:30 -04:00
auth 🤝 fix: Honor OPENID_REUSE_TOKENS in Admin OAuth Exchange (#13154) 2026-05-18 09:34:58 -04:00
AuthController.js feat: Make OpenID Token Reuse Window Configurable (#13546) 2026-06-06 15:15:58 -04:00
AuthController.spec.js feat: Make OpenID Token Reuse Window Configurable (#13546) 2026-06-06 15:15:58 -04:00
Balance.js 🤫 chore: Quiet Repetitive Log Noise from Balance, CloudFront, and Capability Paths (#13461) 2026-06-01 20:40:16 -04:00
Balance.spec.js 🤫 chore: Quiet Repetitive Log Noise from Balance, CloudFront, and Capability Paths (#13461) 2026-06-01 20:40:16 -04:00
ContextProjectionController.js 🪙 feat: SDK-Aligned Context-Usage Projection (gauge for window-switch & snapshot-less branches) (#13801) 2026-06-16 17:54:13 -04:00
EndpointController.js refactor: Integrate Capabilities into Agent File Uploads and Tool Handling (#5048) 2024-12-19 13:04:48 -05:00
FavoritesController.js 📌 feat: Add Pin Support for Model Specs (#11219) 2026-04-09 18:37:25 -04:00
FavoritesController.spec.js 📌 feat: Add Pin Support for Model Specs (#11219) 2026-04-09 18:37:25 -04:00
mcp.js 🥽 fix: Restrict MCP Server URL Disclosure to Admins, Owners, and Editors (#13784) 2026-06-16 11:20:52 -04:00
mcpApps.js fix(mcp): harden sandbox security and fix stale closures, error states 2026-06-23 18:35:27 -07:00
ModelController.js 🏗️ refactor: Remove Redundant Caching, Migrate Config Services to TypeScript (#12466) 2026-03-30 16:49:48 -04:00
PermissionsController.js 🪪 fix: Filter ACL Principal Details (#13524) 2026-06-05 19:06:41 -04:00
PluginController.js 🪪 fix: Resolve Group-Scoped Config Overrides (#13176) 2026-05-18 10:16:20 -04:00
PluginController.spec.js 🪪 fix: Resolve Group-Scoped Config Overrides (#13176) 2026-05-18 10:16:20 -04:00
SkillStatesController.js 🗂️ feat: Add Deployment Skill Directory (#13523) 2026-06-05 10:24:28 -04:00
TokenConfigController.js 🗂️ fix: Scope Token Config Cache (#13770) 2026-06-15 15:25:19 -04:00
tools.js 🧯 fix: Harden Data Retention Semantics (#13049) 2026-05-19 21:58:42 -04:00
TwoFactorController.js 🔑 fix: Require OTP Verification for 2FA Re-Enrollment and Backup Code Regeneration (#12223) 2026-03-14 01:51:31 -04:00
UserController.js 🔐 fix: Honor Admin-Panel MCP Allowlist Overrides Without Restart (#13814) 2026-06-17 20:14:53 -04:00
UserController.spec.js 🛂 fix: Normalize Verification Flow Error Responses (#13558) 2026-06-06 15:08:43 -04:00