CVE-2026-122020

NST Labs Tech Nstbrowser Local Agent Management Service stopAll stopAllBrowsers denial of service

CVSS score

5.3

EPSS probability

—

Risk score

0.5

Published

3 h ago

Overview Public Exploits (0)Newsroom Vulnerability Timeline

Patch status has not yet been verified

Resmî kaynaklarda yeterli kanıt bulunamadı. Bu sonuç “yama yok” anlamına gelmez.

Impact on My Inventory

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Vulnerability description

DayBreach AI Explanation

Verified against sources

NST Labs Tech Nstbrowser Local Agent Management Service Denial of Service Vulnerability

Sources read

Source agreement

Tam uyum

Evidence confidence

%55

Short explanation

A security flaw discovered in the Local Agent Management Service of NST Labs Tech Nstbrowser can lead to a denial of service [S0]. The vulnerability affects the stopAllBrowsers function in the /api/agent/browser/stopAll file [S1].

Why does it matter?

An exploit has been released to the public and remote exploitation is possible [S0], which may lead to operational disruptions in affected components.

What should be done?

Follow vendor advisories and updates
Restrict access to the Local Agent Management Service
Implement network-level monitoring and filtering

Chain of evidence and sources2 verified claims

NST Labs Tech Nstbrowser up to 1.2.1 sürümleri Local Agent Management Service bileşeninde hizmet kesintisi açığı barındırmaktadır.

S0 · daybreach-canonical S1 · cvelist

Açıklık için bir istismar kamuya açıklanmış olup uzaktan istismar edilebilir durumdadır.

S0 · daybreach-canonical

Show the technical text from the sources

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.

CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P

CWE: CWE-404

This explanation was compiled automatically from the source records. Scores, active exploitation, patch and exploit status come straight from the sources.

IMPACT: Affected Products and Software

Affected Products

The following products are affected by CVE-2026-122020 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.

ID	VENDOR	PRODUCT	ACTION
1	NST Labs Tech	Nstbrowser	View

Total affected vendors: 1|Products: 1

RED HAT CSAF/VEX: Product Impact Check

Red Hat has not yet published a CSAF/VEX impact record for this CVE. This does not mean “not affected”.

SCORING: CVSS from Multiple Sources

CVSS Scores

The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.

SCORE	VERSION	SEVERITY	VECTOR	SOURCE
5.3	CVSS V4_0	MEDIUM	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P	CVE CNA
5.0	CVSS V2_0	—	AV:N/AC:L/Au:N/C:N/I:N/A:P/E:POC/RL:ND/RC:C	CVE CNA
5.0	CVSS V2	—	AV:N/AC:L/Au:N/C:N/I:N/A:P	NVD
4.3	CVSS V3_1	MEDIUM	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L/E:P/RL:X/RC:C	CVE CNA
4.3	CVSS V3_0	MEDIUM	CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L/E:P/RL:X/RC:C	CVE CNA
4.3	CVSS V31	MEDIUM	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L	NVD
2.1	CVSS V40	LOW	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X	NVD

Patch and Remediation Guide

Solution & Remediation Advisory

Patch status unknown

İncelenen resmî kaynaklarda yama durumu doğrulanamadı. Bu sonuç “yama yok” anlamına gelmez.

Confirm the affected product and version against the source evidence above.

Restrict access to internet-facing services and apply network segmentation.

Until a patch is confirmed, follow the vendor advisory; do not read an unknown status as “no patch”.

Monitor server logs and network endpoints for signs of anomalous execution.

Public exploit and active exploitation status

Verified exploit intelligence

No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.

Weakness Classification and Attack Patterns (CWE & CAPEC)

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-122020 is associated with the following CWEs:

CWE-404: Common Weakness Enumeration Entry CWE-404

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-122020 weaknesses.

CAPEC-66: SQL Injection CAPEC-126: Path Traversal CAPEC-28: OS Command Injection

Attack Vector and Accessibility

ExposureAğ üzerinden

PermissionsGerekmiyor

User—

Official Sources and Advisories

VDB-431086 | NST Labs Tech Nstbrowser Local Agent Management Service stopAll stopAllBrowsers denial of servicevendor-advisory VDB-431086 | CTI Indicators (IOB, IOC, TTP, IOA)vendor-advisory CVE-2026-122020 | CVE Analysis and Reportvendor-advisory Submit #1024994 | https://www.nstbrowser.io/en nstbroswer 1.2.1 DDOSvendor-advisory https://drive.google.com/drive/folders/1TzU1aHKabEHbMmSbqVR4HhxTAxKO6XII?usp=drive_linkvendor-advisory https://drive.google.com/drive/folders/1TzU1aHKabEHbMmSbqVR4HhxTAxKO6XIIvendor-advisory

CVSS Vector Radar Chart

5.3 / 10

Vulnerability Scoring Details

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone required

User InteractionP

Confidentiality (Gizlilik)Low

Integrity (Bütünlük)P

Availability (Erişilebilirlik)Low

Yama durumu bilinmiyor

İncelenen resmî kaynaklarda yama durumu doğrulanamadı. Bu sonuç “yama yok” anlamına gelmez.

Follow the vendor

NST Labs Tech

Weakness Type (CWE & CAPEC)

CWE-404

Similar Vulnerabilities

5.3

CVE-2026-122028NST Labs Tech Nstbrowser Local Agent API info information disclosure

VendorNST Labs Tech ProductNstbrowser

Patch status unknown3 h ago

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