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

Vulnerability summary

CVE-2026-27512 is a medium (CVSS 6.1) Cross-site Scripting vulnerability in shenzhen tenda technology co., ltd. tenda f3. EPSS estimates a 0.37% chance of exploitation in the next 30 days, higher than 30.1% of scored vulnerabilities.

Timeline

1. 23-02-2026
   PublishedVulnerability first disclosed.
2. 25-05-2026
   Last modifiedVulnerability information updated.

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.

• CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
• CWE-116Improper Encoding or Escaping of OutputThe product prepares a structured message for communication with another component, but encoding or escaping of the data is either missing or done incorrectly. As a result, the intended structure of the message is not preserved.