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

Status: published. Published: 2026-11-04. Updated: 2026-11-04.

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.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- NST Labs Tech / Nstbrowser: 1.21.0 (affected). Source: CNA: VulDB

## Severity and prioritization

- CVSS 4.0: 5.3 (medium); 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; source: CNA: VulDB

- CVSS 3.1: 4.3 (medium); CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:P/RL:X/RC:C; source: CNA: VulDB

- CVSS 3.0: 4.3 (medium); CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:P/RL:X/RC:C; source: CNA: VulDB

- CVSS 2.0: 5 (medium); AV:N/AC:L/Au:N/C:P/I:N/A:N/E:POC/RL:ND/RC:C; source: CNA: VulDB

- CVSS 4.0: 2.1 (low); 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/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; source: NVD: cna@vuldb.com

- CVSS 3.1: 4.3 (medium); CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N; source: NVD: cna@vuldb.com

- CVSS 2.0: 5 (medium); AV:N/AC:L/Au:N/C:P/I:N/A:N; source: NVD: cna@vuldb.com

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-200, CWE-284

## Exploit evidence

- exploit: https://drive.google.com/drive/folders/135l_IZU955OmUNC5so83IiixlPPJp5X1 (CNA: VulDB)

## References

- https://vuldb.com/vuln/431091 (CNA: VulDB; vdb-entry)

- https://vuldb.com/vuln/431091/cti (CNA: VulDB; signature, permissions-required)

- https://vuldb.com/cve/CVE-2026-122028 (CNA: VulDB; third-party-advisory)

- https://vuldb.com/submit/1025065 (CNA: VulDB; third-party-advisory)

- https://drive.google.com/drive/folders/135l_IZU955OmUNC5so83IiixlPPJp5X1?usp=drive_link (CNA: VulDB; related)

- https://drive.google.com/drive/folders/135l_IZU955OmUNC5so83IiixlPPJp5X1 (CNA: VulDB; exploit)

- https://drive.google.com/drive/folders/135l_IZU955OmUNC5so83IiixlPPJp5X1 (cna@vuldb.com)

- https://drive.google.com/drive/folders/135l_IZU955OmUNC5so83IiixlPPJp5X1?usp=drive_link (cna@vuldb.com)

- https://vuldb.com/cve/CVE-2026-122028 (cna@vuldb.com)

- https://vuldb.com/submit/1025065 (cna@vuldb.com)

- https://vuldb.com/vuln/431091 (cna@vuldb.com)

- https://vuldb.com/vuln/431091/cti (cna@vuldb.com)

## Provenance

- CNA: VulDB: https://www.cve.org/CVERecord?id=CVE-2026-122028; retrieved 2026-11-04; source updated 2026-11-04

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-122028; retrieved 2026-11-05; source updated 2026-11-04

Revision: 6679187d45ac9c8b84d1f478cda9be224fcdfeed81681a0a2030fef7672b94cc

Canonical: https://y2.dev/cve/CVE-2026-122028

## Agent and API access

Public CVE pages, Markdown, and JSON are free to read without an account or API key.

- Public catalog: https://y2.dev/cve/index.json. Follow nextCursor with the same search, filters, sort, and limit (1–100). A null cursor marks the end.

- WebMCP: search_cve_disclosures, get_cve_disclosure, get_cve_page_markdown, get_y2_cve_access. Available in compatible browsers.

- Cyber API: https://api.y2.dev/api/v2/cyber/cves and https://api.y2.dev/api/v2/cyber/cves/{cveId}.

- Y2 Pro or Elite: create a workspace API key with the intel:cyber scope and send Authorization: Bearer <Y2_API_KEY>. Setup: https://y2.dev/docs/api/create-key.

- x402: Pay per request without an account or API key. Omit Authorization, read the HTTP 402 PAYMENT-REQUIRED challenge, validate its current requirements, and retry with PAYMENT-SIGNATURE through an authorized payment client. These browser tools never make payments. Guide: https://y2.dev/docs/api/x402.

- OpenAPI: https://y2.dev/api/openapi.yaml. Agent access metadata: https://y2.dev/cve/agent.json.

Collected public records only. Check source status for coverage and freshness.