CVE-2026-11405
Hidden backdoor authentication mechanism in multiple versions of Tenda firmware allows admin access to web management interface
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
INFO
Published Date :
July 6, 2026, 8:16 p.m.
Last Modified :
July 8, 2026, 2:16 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Affected Products
The following products are affected by CVE-2026-11405
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | CRITICAL | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
Solution
- Remove the backdoor password configuration.
- Rebuild the web server binary without the backdoor.
- Deploy the updated web server binary.
Public PoC/Exploit Available at Github
CVE-2026-11405 has a 4 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-11405.
| URL | Resource |
|---|---|
| https://cwe.mitre.org/data/definitions/912.html | |
| https://kb.cert.org/vuls/id/213560 | |
| https://www.kb.cert.org/vuls/id/213560 |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-11405 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-11405
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
CVE-2026-11405 - Draft
Loginsoft Vulnerability Intelligence (LOVI)
WiFi Cha0s t00lkit w/ multi payload options (aka ROUTER DADDY)
Python HTML VBA Batchfile
📡 PoC auto collect from GitHub. ⚠️ Be careful Malware.
security cve exploit poc vulnerability
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-11405 vulnerability anywhere in the article.
-
The Cyber Express
RabbitMQ Vulnerability Exposes OAuth Secrets to Attackers
A newly disclosed RabbitMQ vulnerability, tracked as CVE-2026-5721, has raised concerns among enterprise users after researchers revealed that the flaw could allow unauthenticated attackers to retriev ... Read more
-
The Cyber Express
CISA Warns of Actively Exploited Joomla Zero-Day Vulnerabilities
The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has added CVE-2026-48939 and CVE-2026-56291 to its Known Exploited Vulnerabilities (KEV) catalog after reports confirmed active zero-da ... Read more
-
The Cyber Express
The Cyber Express Weekly Roundup: Campus Cyberattack, Januscape VM Escape, Router Backdoors, UniFi Flaw, and Wireshark Security Updates
Enterprise infrastructure is increasingly under pressure as attackers and researchers alike expose weaknesses across the technology stack. This week, a confirmed university cyberattack, a critical Lin ... Read more
-
The Cyber Express
Ubiquiti Fixes Critical CVE-2026-50746 and Multiple UniFi OS Vulnerability Flaws
Ubiquiti has released security updates to address several critical security flaws, led by CVE-2026-50746, a maximum-severity UniFi OS vulnerability with a CVSS score of 10.0. Published in Security Adv ... Read more
-
The Cyber Express
CERT Warns of Unpatched Tenda Firmware Backdoor Allowing Admin Access
The CERT Coordination Center (CERT/CC) has disclosed a critical security issue affecting multiple Tenda networking devices. Tracked as CVE-2026-11405, the vulnerability stems from an undocumented back ... Read more
-
The Cyber Express
Wireshark 4.6.7 Fixes 12 Security Issues Across SSH, IEEE 802.11, Catapult DCT2000 and Other Protocols
The latest Wireshark 4.6.7 maintenance release addresses twelve security vulnerabilities that could affect users analyzing network traffic. Since packet captures processed in Wireshark pass through nu ... Read more
-
security.nl
Backdoor in Tenda-routers nog altijd zonder update waarschuwen onderzoekers
Een backdoor in routers van fabrikant Tenda waardoor remote aanvallers als beheerder kunnen inloggen is nog altijd niet gepatcht, zo waarschuwen onderzoekers van het CERT Coordination Center (CERT/CC) ... Read more
-
The Hacker News
CERT/CC Warns of Hidden Admin Backdoor in Tenda Router Firmware
Several versions of firmware released by Chinese network device manufacturer Tenda have been found to embed an undocumented authentication backdoor that enables administrative access to the devices' w ... Read more
The following table lists the changes that have been made to the
CVE-2026-11405 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jul. 08, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Changed SSVC {'id': 'CVE-2026-11405', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'yes'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-07-07T00:00:00+00:00'} {'id': 'CVE-2026-11405', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'yes'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-07-08T03:56:43.961536Z'} -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jul. 08, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-11405', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'yes'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-07-07T00:00:00+00:00'} -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Jul. 06, 2026
Action Type Old Value New Value Added Reference https://www.kb.cert.org/vuls/id/213560 -
New CVE Received by [email protected]
Jul. 06, 2026
Action Type Old Value New Value Added 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'}]}] Added 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 Added Reference https://cwe.mitre.org/data/definitions/912.html Added Reference https://kb.cert.org/vuls/id/213560