Vulnerability · Published Oct 5, 2026 · Assigned by GitHub_M

CVE-2026-105761Dify: IDOR in AppMCPServer PUT Endpoint Allows Modification of Other Apps' MCP Servers

High 7.1

In plain English

A high-severity authorization bypass via user-controlled key in dify from langgenius. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 16% of all known vulnerabilities).

Severity (CVSS 3.1)7.1High

Exploit odds (30 days)0.2%top 84.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

Dify is an open-source LLM app development platform. Prior to 1.16.0, the PUT /console/api/apps/<app_id>/server endpoint in api/controllers/console/app/mcp_server.py used AppMCPServerController.put() to retrieve an AppMCPServer by the client-supplied server ID without verifying that the server belonged to the requested application and tenant. An authenticated workspace member could therefore change another application's MCP server status and parameters, potentially redirecting data or disabling the service. This issue is fixed in version 1.16.0.

Affected products (as reported)

Vendor	Product	Versions
langgenius	dify	< 1.16.0

Weakness: CWE-639 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L

References

https://github.com/langgenius/dify/security/advisories/GHSA-ccrj-frp2-c945 x_refsource_CONFIRM
https://github.com/langgenius/dify/pull/38177 x_refsource_MISC
https://github.com/langgenius/dify/commit/62cb5b586504b730731e28e743c038b72950058e x_refsource_MISC
https://github.com/langgenius/dify/releases/tag/1.16.0 x_refsource_MISC