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CVE-2026-11405 is an undocumented authentication backdoor in multiple Tenda firmware versions affecting the web management interface. The flaw resides in the login() function of the embedded web server binary, where normal MD5-based password verification is followed by a hidden alternate authentication path after failure. In that path, the firmware retrieves a separate password value from device configuration and performs a direct plaintext comparison against the user-supplied password. If the comparison succeeds, the code assigns administrator privileges and creates a valid authenticated session. The alternate path does not validate the supplied username, so any username is accepted when paired with the backdoor password. This hidden functionality bypasses the intended credential verification model and exposes administrative access outside the normal authentication workflow.
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No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
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68 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A backdoor authentication vulnerability in Tenda router firmware that allows administrative access using a hidden plaintext password checked through an undocumented login path.
An undocumented authentication backdoor in Tenda router firmware that allows an attacker to bypass normal login and gain administrator-level access because the firmware validates only a stored password value and not the username.
Hidden authentication backdoor in Tenda router/network equipment firmware. The /bin/httpd login() function falls back to an alternate password from device configuration and grants administrator access without validating the username.
An authentication bypass vulnerability caused by an undocumented backdoor in Tenda firmware that can grant administrative access to affected networking devices’ web management interfaces.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.