Auth bypass in Cosmicstack-Labs Mercury-Agent
CVE-2026-90810
A security flaw has been discovered in cosmicstack-labs mercury-agent up to 1.1.13. The impacted element is the function PermissionManager.checkShellCommand of the file mercury-agent/src/capabilities/permissions.ts of the component Shell Command Permission Check. Performing a manipulation results in improper authorization. The attack can be initiated remotely. The exploit has been released to the public and may be used for attacks. The project was informed of the problem early through an issue report but has not responded yet.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.004 (30.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 30th percentile — 30.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Cosmicstack-Labs Mercury-Agent — versions 1.1.0, 1.1.1, 1.1.10
Weakness classification (CWE)
References
- vuldb.com/vuln/403312 (technical-description, vdb-entry)
- vuldb.com/vuln/403312/cti (signature, permissions-required)
- vuldb.com/cve/CVE-2026-90810 (third-party-advisory)
- vuldb.com/submit/922876 (third-party-advisory)
- github.com/cosmicstack-labs/mercury-agent/issues/101 (issue-tracking, exploit)
- github.com/cosmicstack-labs/mercury-agent/ (product)
Frequently asked questions
- What is CVE-2026-90810?
- CVE-2026-90810 is a medium-severity vulnerability in Cosmicstack-Labs Mercury-Agent, classified under Incorrect Privilege Assignment. CVSS score: 6.3/10. Published 2026-09-14.
- How severe is CVE-2026-90810?
- Medium severity. CVSS v3 base score is 6.3 out of 10.