Improper Authentication Vulnerability in light0011 CMS by Light0011
CVE-2026-86306

6.9MEDIUM

Key Information:

Vendor

Light0011

Status
Cms
Vendor
CVE Published:
7 September 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-86306?

A vulnerability has been discovered in the light0011 CMS, specifically within the Cookie Helper component. An issue in the UserModel.class.php file allows attackers to manipulate the Username argument, leading to improper authentication. This issue can potentially be exploited remotely. The affected version utilizes a rolling release model, meaning detailed version information is not readily available. Despite early notification of the problem from the community, there has yet to be a response or patch from the developers.

Affected Version(s)

cms c774dce31c6df0055568a8d5c53d964d99be199d

cms f72cf46f601efb2a0618c3814cc2f61380b38930

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-2026-86306 - Proof of Concept

References

https://vuldb.com/vuln/399479
vdb-entrytechnical-description
https://vuldb.com/vuln/399479/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-86306
third-party-advisory

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
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

404my (VulDB User)
VulDB CNA Team
.