Quick answers
- Is CVE-2026-18646 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-18646 being exploited in the wild.
- How severe is CVE-2026-18646?
- Medium severity, with a CVSS score of 5.3, published 3 August 2026.
- Which products and versions are affected?
- Danpros HTMLy up to 3.1.1.
- Is there a fix for CVE-2026-18646?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-18646 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-18646?
- Check whether you run Danpros HTMLy at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
A path traversal vulnerability (CWE-22) exists in the /author/:name route handler within /system/htmly.php (lines 300–312). The $name URL parameter is concatenated directly into two filesystem paths—config/users/$name.ini and $vroot/layout--profile--$name.html.php—without sanitization; the strtolower() function applied does not block ../ sequences. Unauthenticated attackers can inject path traversal sequences (e.g., ..%2F..%2F..%2F) to probe arbitrary file existence on the server via differential HTTP responses (200 vs 404). Although the .ini and .html.php suffixes limit direct file reading, attackers can enumerate the filesystem structure, verify existence of sensitive files (e.g., config files, logs), and identify user accounts. The route is publicly accessible and requires no authentication or user interaction.
Affected products
- danpros HTMLy up to 3.1.1
Timeline
- 2026-06-10: disclosed: Vulnerability reported on GitHub
- 2026-08-03: advisory: Published on NVD