Missing Authentication in Linksys EA8100 Router's JNAP API
CVE-2026-127275

10CRITICAL

Key Information:

Vendor

Linksys
Status
Ea8100
Vendor
CVE Published:
12 November 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-127275?

A critical security issue has been identified in the Linksys EA8100 router's JNAP API, specifically in version 1.0.3.216940. The vulnerability arises from the SetRemoteSetting and SetUnsecuredWiFiWarning functions within the ui_server.lua file, which allow remote attackers to exploit missing authentication on the isEnabled/enabled argument. This flaw enables attackers to initiate unauthorized actions without proper verification. The issue has been publicly disclosed, and despite early notifications to the vendor, there has been no response to mitigate the risk associated with this vulnerability.

Affected Version(s)

EA8100 1.0.3.216940

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-2026-127275 - Proof of Concept

References

https://vuldb.com/vuln/436430
vdb-entrytechnical-description
https://vuldb.com/vuln/436430/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-127275
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

geochen (VulDB User)
VulDB CNA Team
.