{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-11405", "assignerOrgId": "37e5125f-f79b-445b-8fad-9564f167944b", "state": "PUBLISHED", "assignerShortName": "certcc", "dateReserved": "2026-06-05T18:12:15.445Z", "datePublished": "2026-07-06T19:17:07.891Z", "dateUpdated": "2026-07-06T20:37:55.739Z"}, "containers": {"cna": {"title": "Hidden backdoor authentication mechanism in multiple versions of Tenda firmware allows admin access to web management interface", "descriptions": [{"lang": "en", "value": "The web server binary /bin/httpd contains a hidden backdoor authentication mechanism in the login() function at 004c88b8.\r\n\r\n- The function contains a normal authentication path using MD5/hash-based password verification (prod_encode64/PasswordToMd5/check_rand_key).\r\n- After normal authentication fails, it calls GetValue(\"sys.rzadmin.password\") to read a backdoor password from the device configuration.\r\n- It performs a direct strcmp() comparison (plaintext, not hashed) between the config value and the user-supplied password.\r\n\r\nA successful match grants role=2 (admin-level access) and creates a valid session. The rzadmin username is never checked \u2014 any username works with the backdoor"}], "source": {"discovery": "UNKNOWN"}, "affected": [{"vendor": "Tenda", "product": "firmware", "versions": [{"status": "affected", "version": "US_AC6V2.0RTL_V15.03.06.51_multi_T"}]}, {"vendor": "Tenda", "product": "firmware", "versions": [{"status": "affected", "version": "US_AC5V1.0RTL_V15.03.06.48_multi_TDE01"}]}, {"vendor": "Tenda", "product": "firmware", "versions": [{"status": "affected", "version": "US_AC10V1.0re_V15.03.06.46_multi_TDE01"}]}, {"vendor": "Tenda", "product": "firmware", "versions": [{"status": "affected", "version": "US_W15EV1.0br_V15.11.0.5(1068_1567_841)_EN_TDE"}]}, {"vendor": "Tenda", "product": "firmware", "versions": [{"status": "affected", "version": "US_FH1201V1.0BR_V1.2.0.14(408)_EN_TD"}]}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "CWE-912: Hidden Functionality"}]}], "references": [{"url": "https://cwe.mitre.org/data/definitions/912.html"}, {"url": "https://kb.cert.org/vuls/id/213560"}], "x_generator": {"engine": "VINCE 3.0.43", "env": "prod", "origin": "https://cveawg.mitre.org/api/cve/CVE-2026-11405"}, "providerMetadata": {"orgId": "37e5125f-f79b-445b-8fad-9564f167944b", "shortName": "certcc", "dateUpdated": "2026-07-06T19:24:17.280Z"}}, "adp": [{"title": "CVE Program Container", "references": [{"url": "https://www.kb.cert.org/vuls/id/213560"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2026-07-06T20:37:55.739Z"}}]}}

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