Authorization Vulnerability in cosmicstack-labs mercury-agent Affects Remote Commands
CVE-2026-18997

5.3MEDIUM

Key Information:

Vendor

Cosmicstack-labs

Status
Mercury-agent
Vendor
CVE Published:
6 August 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-18997?

A vulnerability exists in the cosmicstack-labs mercury-agent affecting versions up to 1.1.12. The issue arises in the function Agent.handleBgCommand located in the src/core/agent.ts file. This vulnerability enables attackers to exploit incorrect authorization mechanisms remotely, which could lead to unauthorized access and manipulation of backend commands. Despite being reported early on, no response has been documented from the developers regarding a fix, thereby leaving systems vulnerable until addressed.

Affected Version(s)

mercury-agent 1.1.0

mercury-agent 1.1.1

mercury-agent 1.1.2

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-2026-18997 - Proof of Concept

References

https://vuldb.com/vuln/386380
vdb-entrytechnical-description
https://vuldb.com/vuln/386380/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-18997
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

ChenMarry (VulDB User)
VulDB CNA Team
.