---
id: CVE-2026-121615
title: Linksys E5600 Login mesh_login.cgi improper authentication
summary: >-
  A vulnerability was determined in Linksys E5600 1.1.0.26. Affected is an
  unknown function of the file /cgi-bin/mesh_login.cgi of the component Login
  Handler. Executing a manipulation can lead to improper authentication. The
  attack can be…
severity: critical
cvss: 10
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:P/RL:X/RC:C'
cvssSource: cna
cwe:
  - CWE-287
vendor: Linksys
product: E5600
affected:
  - E5600 1.1.0.26
published: '2026-11-04'
updated: '2026-11-04'
sourceUpdated: '2026-11-04T02:15:20.055Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-121615'
references:
  - url: 'https://vuldb.com/vuln/430463'
    label: VDB-430463 | Linksys E5600 Login mesh_login.cgi improper authentication
  - url: 'https://vuldb.com/vuln/430463/cti'
    label: 'VDB-430463 | CTI Indicators (IOB, IOC, IOA)'
  - url: 'https://vuldb.com/cve/CVE-2026-121615'
    label: CVE-2026-121615 | CVE Analysis and Report
  - url: 'https://vuldb.com/submit/1023310'
    label: 'Submit #1023310 | Linksys E5600 1.1.0.26 Improper Authentication (CWE-287)'
  - url: 'https://github.com/Zimo-666/E5600-cves/tree/main/02-mesh-login-auth-bypass'
  - url: 'https://www.linksys.com/'
tags:
  - cve.org
epss: 0.00754
epssPercentile: 0.55343
ingestedAt: '2026-11-05T20:33:06.661Z'
---

## Overview

A vulnerability was determined in Linksys E5600 1.1.0.26. Affected is an unknown function of the file /cgi-bin/mesh_login.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.

## Affected

- `E5600 1.1.0.26`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.