Vulnerability in Nst Labs Tech Nstbrowser
CVE-2026-122020
A security flaw has been discovered in NST Labs Tech Nstbrowser up to 1.2.1. The affected element is the function stopAllBrowsers of the file /api/agent/browser/stopAll of the component Local Agent Management Service. Performing a manipulation results in denial of service. Remote exploitation of the attack is possible. The exploit has been released to the public and may be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Nst Labs Tech Nstbrowser — versions 1.2.0, 1.2.1
Weakness classification (CWE)
References
- drive.google.com/drive/folders/1TzU1aHKabEHbMmSbqVR4HhxTAxKO6XII (exploit)
- drive.google.com/drive/folders/1TzU1aHKabEHbMmSbqVR4HhxTAxKO6XII (related)
- CVE-2026-122020 | CVE Analysis and Report (third-party-advisory)
- Submit #1024994 | https://www.nstbrowser.io/en nstbroswer 1.2.1 DDOS (third-party-advisory)
- VDB-431086 | NST Labs Tech Nstbrowser Local Agent Management Service stopAll stopAllBrowsers denial of service (technical-description, vdb-entry)
- VDB-431086 | CTI Indicators (IOB, IOC, TTP, IOA) (signature, permissions-required)
Frequently asked questions
- What is CVE-2026-122020?
- CVE-2026-122020 is a medium-severity vulnerability in Nst Labs Tech Nstbrowser, classified under Improper Resource Shutdown or Release. CVSS score: 4.3/10. Published 2026-11-04.
- How severe is CVE-2026-122020?
- Medium severity. CVSS v3 base score is 4.3 out of 10.