Access Control Flaw in MCP Gmail Tool by j3k0
CVE-2026-10277

5.3MEDIUM

Key Information:

Vendor

J3k0

Status
Mcp-google-workspace
Vendor
CVE Published:
1 June 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-10277?

A vulnerability in the MCP Gmail Tool of j3k0 was identified, affecting its saveToDisk function in the src/tools/gmail.ts file. This flaw allows unauthorized actions due to improper access controls, which could be exploited remotely. A patch has been provided to remediate the issue, emphasizing the importance of keeping the software updated for security enhancement. The tool follows a rolling release model, complicating version specifics, but the recent patch with the identifier 89c091ecf8b9f9c7291d1af0b1966e271f86551c should be applied promptly to mitigate risks.

Affected Version(s)

mcp-google-workspace 831790e7d5c2663325733d9f5579cc339a267c4c

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-2026-10277 - Proof of Concept

References

https://vuldb.com/vuln/367570
vdb-entrytechnical-description
https://vuldb.com/vuln/367570/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-10277
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

ccccccctfi (VulDB User)
.