Vulnerability · Published Sep 14, 2026 · Assigned by VulDB

CVE-2026-90812cosmicstack-labs mercury-agent Shell Command Permission permissions.ts checkShellCommand privileges assignment

Medium 4.3

In plain English

A medium-severity security flaw in mercury-agent from cosmicstack-labs. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 33% of all known vulnerabilities).

Severity (CVSS 3.1)4.3Medium

Exploit odds (30 days)0.4%top 67.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

A security vulnerability has been detected in cosmicstack-labs mercury-agent up to 1.2.0. This impacts the function checkShellCommand of the file src/capabilities/permissions.ts of the component Shell Command Permission. The manipulation leads to incorrect privilege assignment. The attack may be initiated remotely. The exploit has been disclosed publicly and may be used. The project was informed of the problem early through an issue report but has not responded yet.

Affected products (as reported)

Vendor	Product	Versions
cosmicstack-labs	mercury-agent	1.01.11.2.0

Weakness: CWE-266 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/E:P/RL:X/RC:R

References

VDB-403314 | cosmicstack-labs mercury-agent Shell Command Permission permissions.ts checkShellCommand privileges assignment vdb-entry, technical-description
VDB-403314 | CTI Indicators (IOB, IOC, TTP, IOA) signature, permissions-required
CVE-2026-90812 | CVE Analysis and Report third-party-advisory
Submit #922878 | CosmicStack Labs Mercury Agent (@cosmicstack/mercury-agent) <= 1.2.0 Incorrect Privilege Assignment (CWE-266) / Exposure of Sensitive Information (CWE-200) third-party-advisory
https://github.com/cosmicstack-labs/mercury-agent/issues/80 exploit, issue-tracking
https://github.com/cosmicstack-labs/mercury-agent/ product