Security Flaw in Linksys EA8100 Web Interface Exposes Sensitive Cookie Data
CVE-2026-127276

6.3MEDIUM

Key Information:

Vendor

Linksys
Status
Ea8100
Vendor
CVE Published:
13 November 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-127276?

A vulnerability in the Linksys EA8100 router's Web UI allows for the manipulation of cookies that lack the 'httponly' flag. This oversight exposes sensitive data and could enable remote attackers to exploit the system. While the attack complexity is deemed high, the exploit is publicly available, highlighting the need for immediate awareness and action. Despite early notification attempts, the vendor has not responded regarding this security concern, leaving users vulnerable to potential threats.

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-2026-127276 - Proof of Concept

References

https://vuldb.com/vuln/436431
vdb-entry
https://vuldb.com/vuln/436431/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-127276
third-party-advisory

CVSS V4

Score:
6.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
High
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
.