CVE-2025-9533 TOTOLINK T10 formLoginAuth.htm improper authentication

Medium 6.9 Published 27 Aug 2025 Updated 27 Aug 2025

Remote attackers can bypass authentication on TOTOLINK T10 routers by manipulating the authCode parameter in formLoginAuth.htm.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2025-9533?

CVE-2025-9533 is a medium-severity authentication bypass vulnerability in TOTOLINK T10, published on 27 Aug 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A vulnerability has been found in TOTOLINK T10 4.1.8cu.5241_B20210927. Affected is an unknown function of the file /formLoginAuth.htm. The manipulation of the argument authCode with the input 1 leads to improper authentication. The attack can be initiated remotely. The exploit has been disclosed to the public and may be used.

Weakness: CWE-287

Which versions are affected by CVE-2025-9533?

It affects 1 product.

Products include Totolink T10 Firmware.

How do I fix CVE-2025-9533?

No fix has been published for CVE-2025-9533 yet. Limit exposure of the affected software until one is available.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2025-9533 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-9533 exists.

Sources

Also known as GHSA-43m2-5vcp-3fpm.