Missing Authentication in BillaBear Installation Handler
CVE-2026-116257

6.9MEDIUM

Key Information:

Vendor

BillaBear

Status
Billabear
Vendor
CVE Published:
26 October 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-116257?

A security flaw exists in the BillaBear Installation Handler, specifically in the processInstall function located in the InstallController.php file. This vulnerability permits an attacker to manipulate the installation process due to a lack of proper authentication, leading to potential unauthorized access. The exploit has been made public, increasing the urgency for remediation, as remote exploitation is feasible. Despite early notification to the vendor regarding the issue, no response has been received, highlighting the need for users to take precautionary measures to protect their systems.

Affected Version(s)

BillaBear 2025.01.03

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-2026-116257 - Proof of Concept

References

https://vuldb.com/vuln/426296
vdb-entrytechnical-description
https://vuldb.com/vuln/426296/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-116257
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

hbynb (VulDB User)
VulDB CNA Team
.