CVE-2026-27512 Tenda F3 Reflected Script Execution via Missing nosniff Header
Attackers can execute scripts in the admin interface via MIME sniffing due to missing nosniff headers, potentially compromising router administration.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-27512?
CVE-2026-27512 is a medium-severity cross-site scripting vulnerability in Shenzhen Tenda Technology Co., Ltd. Tenda F3, published on 23 Feb 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Which versions are affected by CVE-2026-27512?
It affects 1 product.
Products include Tenda F3 Firmware.
How do I fix CVE-2026-27512?
No fix has been published for CVE-2026-27512 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-27512 being exploited?
There is no known exploitation of CVE-2026-27512 in the wild and no public exploit code.
Other vulnerabilities in Shenzhen Tenda Technology Co., Ltd. Tenda F3
Sources
Also known as GHSA-62pw-p3ph-rgh9.