A recently discovered vulnerability (CVE-2026-42824) highlighted a dangerous reality: AI assistants like Microsoft 365 Copilot are only as secure as the permissions you have set.

Overview
Several versions of Tenda firmware contain an undocumented authentication backdoor that grants administrative access to the devices’ web management interfaces. An attacker can expoit this vulnerability, tracked as CVE-2026-11405, to bypass the password verification process and obtain full administrative control without valid credentials.
Affected Versions:
* US_FH1201V1.0BR_V1.2.0.14(408)_EN_TD
* US_W15EV1.0br_V15.11.0.5(1068_1567_841)_EN_TDE
* US_AC10V1.0re_V15.03.06.46_multi_TDE01
* US_AC5V1.0RTL_V15.03.06.48_multi_TDE01
* US_AC6V2.0RTL_V15.03.06.51_multi_T
Description
Tenda is a supplier of home and business network devices such as routers, switches, wireless access points, and video surveillance equipment. Most of these devices include web-based interfaces that allow users to perform configuration and management operations, which are protected by username/password authentication to prevent unauthorized modifications.
The web server binary /bin/httpd contains an undocumented backdoor authentication mechanism in the login() function. Initially, the function follows a normal authentication path using MD5-based password verification. However, if authentication fails, the function invokes GetValue(“sys.rzadmin.password”) to retrieve an alternate password value from the device configuration. It then performs a direct strcmp() comparison in plaintext between the user-supplied password and the configuration-stored value. A successful match grants role=2 admin-level access and creates a valid session.
The associated username is not validated, so any provided username will succeed when paired with the backdoor password. This backdoor authentication mechanism is not documented or visible through any administrative interface.
Impact
Successful exploitation grants full administrative access to the device’s web interface, regardless of the configured administrator account credentials. With administrative control, an attacker can reconfigure the device, alter network settings, and disable security features, enabling broader compromise of the local network.
Solution
Unfortunately, we were unable to reach the vendor to coordinate this vulnerability. Since a patch is unavailable, we can only offer mitigation strategies. The following workarounds can help mitigate this vulnerability’s impact until a fixed version is released:
Disable remote management on your device
If your device supports remote web management, disable it. Disabling this feature prevents attackers on external networks from accessing your device’s administrative dashboard over the internet.
Restrict local network exposure
Changing the default LAN IP address may reduce opportunistic discovery by automated scanners that target known default IP ranges. Note that this measure does not prevent deliberate or targeted network scanning.
Acknowledgements
Thanks to the reporter who wishes to remain anonymous. This document was written by Bob Kemerer.

Overview
HP Printers in the Deskjet 2800 Series running firmware version <=TBP1CN2612AR contain a missing authorization vulnerability tracked as CVE-2026-13753. This vulnerability allows unauthenticated access to the printer’s webserver API endpoints, exposing Wi-Fi credentials, management configuration details, and sensitive security data normally restricted to administrative users.
Description
Modern HP printers provide a web-based management interface for configuring content such as Wi-Fi Direct settings, SNMP management access, and device security options. When accessed normally through the browser interface, these pages explicitly require administrator credentials before sensitive information is displayed. This information is protected because, for example, Wi-Fi Direct controls the printer’s direct wireless connectivity, and SNMP configuration settings can reveal detailed information about the device’s monitoring and management controls.
In affected firmware versions, the authorization requirement can be bypassed by sending direct, unauthenticated GET requests to multiple backend API endpoints. The affected endpoints return administrative configuration data without validating session state or authentication, including the Wi-Fi Direct SSID and plaintext passphrase, unique printer serial numbers and service IDs, and details about the device’s administrative password state. This information is freely disclosed even though the corresponding web interface pages correctly enforce authentication, indicating an authorization flaw in the API layer.
Impact
A remote attacker with network access to the printer can bypass the web interface’s authentication requirements and retrieve sensitive configuration data directly from backend APIs. Exposed information includes Wi-Fi Direct credentials, SNMP configuration details, device identity information, cloud service registration metadata, and other information involving the device’s administrative security state. An attacker could use this information to gain unauthorized wireless access, perform reconnaissance on network or cloud integrations, impersonate the device, or facilitate further compromise of the printing environment.
Solution
Unfortunately, we were unable to reach HP to coordinate this vulnerability, so a firmware patch is not yet available. To limit the risk of this vulnerability, users should restrict network access to the printer’s web interface by placing the device on a trusted or isolated network segment, disable Wi‑Fi Direct if it is not required, and limit SNMP access to trusted systems or disable it entirely. Firewall or access-control list (ACL) rules should be used to prevent untrusted hosts from reaching the printer’s management ports, and discovery or cloud service features that are not needed should be disabled.
Acknowledgements
Thanks to Nguyễn Tiến Dũng for researching and reporting this vulnerability. This document was written by Molly Jaconski.