Missing Authentication in Linksys E5350 Setup Wizard
CVE-2026-121933

10CRITICAL

Key Information:

Vendor

Linksys
Status
E5350
Vendor
CVE Published:
4 November 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-121933?

A security vulnerability has been identified in the Linksys E5350 router's Setup Wizard, specifically within the save_settings function of the /wizard/apply.cgi file. This flaw allows an attacker to manipulate the argument wizard_router_pwd, leading to an absence of necessary authentication mechanisms. As a result, the vulnerability can be exploited remotely, potentially allowing unauthorized access to the system. Despite efforts to notify the vendor about this issue, there has been no response regarding mitigation or patching, emphasizing the urgency for affected users to address this vulnerability proactively.

Affected Version(s)

E5350 1.0.00.037

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-2026-121933 - Proof of Concept

References

https://vuldb.com/vuln/431045
vdb-entrytechnical-description
https://vuldb.com/vuln/431045/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-121933
third-party-advisory

CVSS V4

Score:
10
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
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
.