Improper Authorization Vulnerability in cosmicstack-labs mercury-agent
CVE-2026-90810

5.3MEDIUM

Key Information:

Vendor

Cosmicstack-labs

Status
Mercury-agent
Vendor
CVE Published:
14 September 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-90810?

A security flaw exists in the cosmicstack-labs mercury-agent affecting versions up to 1.1.13, specifically in the function PermissionManager.checkShellCommand. This vulnerability enables improper authorization, which can be exploited remotely. The issue was reported to the developers, but they have yet to respond. Security measures need to be reinforced to protect against potential attacks leveraging this flaw.

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-2026-90810 - Proof of Concept

References

https://vuldb.com/vuln/403312
vdb-entrytechnical-description
https://vuldb.com/vuln/403312/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-90810
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

Eric-a (VulDB User)
VulDB CNA Team
.