Path Traversal Vulnerability in danpros HTMLy Affected by Delete Username Endpoint
CVE-2026-18644

5.3MEDIUM

Key Information:

Vendor

Danpros

Status
Htmly
Vendor
CVE Published:
3 August 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-18644?

A path traversal vulnerability has been identified in danpros HTMLy, specifically within the Delete Username Endpoint functionality of the file /system/htmly.php. Remote attackers can exploit this weakness by manipulating the argument 'File' to access unauthorized files on the system. The exploit method is publicly known, raising significant security concerns. Communication attempts with the vendor regarding this issue have gone unanswered, leaving users at risk of potential attacks.

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-2026-18644 - Proof of Concept

References

https://vuldb.com/vuln/385563
vdb-entrytechnical-description
https://vuldb.com/vuln/385563/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-18644
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
.