Information Disclosure Vulnerability in Linksys E5600 Router
CVE-2026-121618

6.9MEDIUM

Key Information:

Vendor

Linksys
Status
E5600
Vendor
CVE Published:
4 November 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-121618?

A vulnerability has been discovered in the Linksys E5600 Router version 1.1.0.26, affecting a component known as Factory Quality Control located at /cgi-bin/fqc.cgi. This weakness allows for potential information disclosure, enabling remote attackers to exploit the vulnerability. Publicly available exploits could compromise data, emphasizing the need for users of unsupported products to take immediate action.

Affected Version(s)

E5600 1.1.0.26

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-121618 - Proof of Concept

References

https://vuldb.com/vuln/430466
vdb-entry
https://vuldb.com/vuln/430466/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-121618
third-party-advisory

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

liuyingqi (VulDB User)
VulDB CNA Team
.