Information Disclosure Vulnerability in cosmicstack-labs mercury-agent
CVE-2026-90811

4.8MEDIUM

Key Information:

Vendor

Cosmicstack-labs

Status
Mercury-agent
Vendor
CVE Published:
14 September 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-90811?

A vulnerability exists in the cosmicstack-labs mercury-agent, specifically within the PermissionManager.checkShellCommand function in the Shell Permission Manifest. This flaw could allow unauthorized access to sensitive data during local execution. Although the project team was notified about this issue through an issue report, there has been no response or remediation provided as of now. The exploit is publicly available, increasing the risk of exploitation for users of the affected versions.

Affected Version(s)

mercury-agent 1.0

mercury-agent 1.1

mercury-agent 1.2.0

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-2026-90811 - Proof of Concept

References

https://vuldb.com/vuln/403313
vdb-entrytechnical-description
https://vuldb.com/vuln/403313/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-90811
third-party-advisory

CVSS V4

Score:
4.8
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
None
Attack Vector:
Local
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
.