CVE-2026-121615: Linksys E5600 Login mesh_login.cgi improper authentication
A vulnerability was determined in Linksys E5600 1.1.0.26. Affected is an unknown function of the file /cgi-bin/meshlogin.cgi of the component Login Handler. Executing a manipulation can lead to improper authentication. The attack can be launched remotely. The exploit has been publicly disclosed and may be utilized. The vendor was contacted early about this disclosure but did not respond in any way. This vulnerability only affects products that are no longer supported by the maintainer.
Event History
Frequently Asked Questions
Who is exposed to this issue?
Linksys E5600 devices running version 1.1.0.26 are identified as affected. The issue is remotely reachable through the Login Handler endpoint at /cgi-bin/mesh_login.cgi, and the affected products are no longer supported by the maintainer.
Does exploitation require credentials or user interaction?
No credentials or user interaction are indicated by the supplied severity vector. The attack is described as remotely launchable with low attack complexity.
Is public exploit information available?
Yes. A proof-of-concept flag is present, and the exploit has been publicly disclosed and may be used.
What should operators do if the device cannot be patched?
The vendor did not respond to the disclosure, and the affected product is no longer supported. Prioritize removing or replacing affected devices; at minimum, restrict remote network access to the device and its management interface.