CVE-2026-18645 danpros HTMLy Admin Content Endpoint admin.php add_content path traversal
Remote attackers with admin privileges can exploit a path traversal vulnerability in the HTMLy CMS admin content endpoint to read or modify arbitrary files.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-18645?
CVE-2026-18645 is a medium-severity path traversal vulnerability in danpros HTMLy, published on 3 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A security flaw has been discovered in danpros HTMLy up to 3.1.1. This affects the function add_content of the file /system/admin/admin.php of the component Admin Content Endpoint. Performing a manipulation of the argument oldfile results in path traversal. The attack may be initiated remotely. The exploit has been released to the public and may be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.
Weakness: CWE-22
Which versions are affected by CVE-2026-18645?
How do I fix CVE-2026-18645?
No fix has been published for CVE-2026-18645 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-18645 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-18645 exists.
Sources
Also known as GHSA-4pgp-58q4-x4mw.