Path Traversal Vulnerability in danpros HTMLy Up to Version 3.1.1
CVE-2026-18645

5.3MEDIUM

Key Information:

Vendor

Danpros

Status
Htmly
Vendor
CVE Published:
3 August 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-18645?

A security flaw has been identified in danpros HTMLy, specifically within the add_content function found in /system/admin/admin.php. This vulnerability allows an attacker to manipulate the 'oldfile' argument, leading to potential unauthorized access through path traversal. Exploitation of this flaw can be initiated remotely, and the details of the exploit have been made publicly available. Despite early disclosure attempts, the vendor has not provided an adequate response regarding this issue.

Affected Version(s)

HTMLy 3.1.0

HTMLy 3.1.1

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-2026-18645 - Proof of Concept

References

https://vuldb.com/vuln/385564
vdb-entrytechnical-description
https://vuldb.com/vuln/385564/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-18645
third-party-advisory

CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
None
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

orionyan (VulDB User)
VulDB CNA Team
.