Dify: IDOR in AppMCPServer PUT Endpoint Allows Modification of Other Apps' MCP Servers

published 2026-10-05 34 d ago modified 2026-10-06 33 d ago also EUVD-2026-92852

cvss: 7.1; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.2%; EPSS 0.2% chance of exploitation in 30 days, percentile 15%
public exploits: 0; none known

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.

Patch / fix

links 3

github.com/langgenius/dify@62cb5b5 commit
github.com/langgenius/dify#38177 pull request
github.com/langgenius/dify/releases/tag/1.16.0 release

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 33 d ago (2026-10-06)

Exploit prediction

0.25% chance of exploitation in the next 30 days, higher than 15% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	7.1	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L

Affected products

langgenius dify

Classification

Weakness

CWE-639 Authorization Bypass Through User-Controlled Key

References

Sources

CVE List CVE-2026-105761
NVD CVE-2026-105761

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary