Server-side Request Forgery Vulnerability in Graphlit MCP Server by Graphlit
CVE-2026-19957

5.3MEDIUM

Key Information:

Vendor

Graphlit

Status
Graphlit-mcp-server
Vendor
CVE Published:
16 August 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-19957?

A vulnerability has been discovered in version 1.0.1 of the Graphlit MCP Server, specifically within the fetch function in the src/tools.ts file associated with the ssrf-test endpoint. This vulnerability allows for potential server-side request forgery, enabling attackers to manipulate URL parameters to send requests on behalf of the server. The vulnerability is susceptible to remote exploitation and has publicly available exploits. Despite early notification through an issue report, the Graphlit team has not yet responded to this critical security concern.

Affected Version(s)

graphlit-mcp-server 1.0.1

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-19957 - Proof of Concept

References

https://vuldb.com/vuln/391125
vdb-entrytechnical-description
https://vuldb.com/vuln/391125/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-19957
third-party-advisory

CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

TianyuLi (VulDB User)
VulDB CNA Team
.