CVE-2026-11405 - Hidden backdoor authentication mechanism in multiple versions of Tenda firmware allows admin access to web management interface

CVE ID :CVE-2026-11405
Published : July 6, 2026, 7:17 p.m. | 28 minutes ago
Description :The web server binary /bin/httpd contains a hidden backdoor authentication mechanism in the login() function at 004c88b8. - The function contains a normal authentication path using MD5/hash-based password verification (prod_encode64/PasswordToMd5/check_rand_key). - After normal authentication fails, it calls GetValue("sys.rzadmin.password") to read a backdoor password from the device configuration. - It performs a direct strcmp() comparison (plaintext, not hashed) between the config value and the user-supplied password. A successful match grants role=2 (admin-level access) and creates a valid session. The rzadmin username is never checked — any username works with the backdoor
Severity: 0.0 | NA
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Maloy Roy Orko

I am Maloy Roy Orko. An aspiring security researcher. Learning New Fields and Strategies Since 2019. 💻

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