Vulnerability · Published Jun 25, 2026 · Assigned by VulnCheck

CVE-2026-45233HTMLy CMS 3.1.1 Path Traversal via oldfile Parameter in Autosave

High 8.1

In plain English

A high-severity path traversal in htmly from danpros. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.9% (higher than 60% of all known vulnerabilities).

Severity (CVSS 3.1)8.1High

Exploit odds (30 days)0.9%top 40.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

HTMLy CMS through 3.1.1 contains a path traversal vulnerability that allows low-privileged authenticated attackers to relocate arbitrary files by supplying directory traversal sequences in the oldfile parameter at the admin autosave endpoint. Attackers can pass unsanitized traversal sequences directly to file_exists() and rename() functions in admin.php without canonicalization or directory boundary enforcement to cause unintended relocation of any file writable by the web server process to an attacker-specified draft location.

Affected products (as reported)

Vendor	Product	Versions
danpros	htmly	0 – through 3.1.1

Weakness: CWE-22 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

References

https://gist.github.com/mrgr4yhat/c4df971eafa272ac8c86c15e2829b7fe technical-description, exploit
https://www.vulncheck.com/advisories/htmly-cms-path-traversal-via-oldfile-parameter-in-autosave third-party-advisory