danpros HTMLy up to 3.1.1 Delete Username Endpoint /system/htmly.php unlink File path traversal

Summaryinfo

A vulnerability has been found in danpros HTMLy up to 3.1.1 and classified as critical. This affects the function unlink of the file /system/htmly.php of the component Delete Username Endpoint. Performing a manipulation of the argument File results in path traversal. This vulnerability was named CVE-2026-18644. The attack may be initiated remotely. In addition, an exploit is available. The vendor was contacted early about this disclosure but did not respond in any way.

Detailsinfo

A vulnerability, which was classified as critical, was found in danpros HTMLy up to 3.1.1. This affects the function unlink of the file /system/htmly.php of the component Delete Username Endpoint. The manipulation of the argument file with an unknown input leads to a path traversal vulnerability. CWE is classifying the issue as CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. This is going to have an impact on integrity, and availability.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-18644. The exploitability is told to be easy. It is possible to initiate the attack remotely. Technical details and a public exploit are known. The attack technique deployed by this issue is T1006 according to MITRE ATT&CK.

The exploit is shared for download at github.com. It is declared as proof-of-concept. The vendor was contacted early about this disclosure but did not respond in any way. By approaching the search of inurl:system/htmly.php it is possible to find vulnerable targets with Google Hacking.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Vendor

• danpros

Name

• HTMLy

Version

• 3.1.0
• 3.1.1

CPE 2.3info

• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒

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Threat Intelligenceinfo

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Submitinfo

Accepted

• Submit #854991: danpros htmly v3.1.1 (latest) Path Traversal (by orionyan)

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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