# CVE-2026-45233: HTMLy CMS path traversal in autosave endpoint

Source: https://junglewise.ai/threats/cve-2026-45233-htmly-cms-path-traversal-in-autosave-endpoint  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-25. Updated: 2026-06-25  
License: CC BY 4.0 with a link back

CVE-2026-45233 · Severity: high · CVSS 8.1 · Published 2026-06-25

HTMLy is an open-source content management system (CMS). A security flaw in the system's autosave feature allows a logged-in user with low privileges to move or rename important system files. This could lead to website downtime, loss of configuration data, or the corruption of site content by moving critical files into a draft folder where they no longer function correctly.

Technologies: [Danpros HTMLy](https://junglewise.ai/threats/technologies/htmly). Vendors: [Danpros](https://junglewise.ai/threats/vendors/danpros).

## Quick answers

**Is CVE-2026-45233 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-45233 being exploited in the wild.

**How severe is CVE-2026-45233?** High severity, with a CVSS score of 8.1, published 25 June 2026.

**Which products and versions are affected?** Danpros HTMLy through 3.1.1.

**Is there a fix for CVE-2026-45233?** 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-2026-45233 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-45233?** 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 exists in HTMLy CMS through version 3.1.1 within the autosave functionality. The /admin/autosave endpoint accepts a user-controlled 'oldfile' parameter which is passed directly to PHP's file_exists() and rename() functions in admin.php without proper canonicalization or directory boundary enforcement. An authenticated attacker with low privileges (such as an Author) can use directory traversal sequences (../) to reference and relocate any file writable by the web server process to a draft location. This can result in the corruption of application configuration, denial of service, or unauthorized modification of content owned by other users. Mitigation involves using realpath() to canonicalize paths and verifying that the resolved path resides within the intended content directory.

## Affected products

- danpros HTMLy through 3.1.1

## Timeline

- 2026-06-25: disclosed: Vulnerability reported by Midhun Mohanan
- 2026-06-25: advisory

## References

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

## Related threats

- [danpros HTMLy path traversal in author name handler](https://junglewise.ai/threats/cve-2026-18646-danpros-htmly-path-traversal-in-author-name-handler)
- [danpros HTMLy path traversal in admin content endpoint](https://junglewise.ai/threats/cve-2026-18645-danpros-htmly-path-traversal-in-admin-content-endpoint)
- [danpros HTMLy path traversal in Delete Username Endpoint](https://junglewise.ai/threats/cve-2026-18644-danpros-htmly-path-traversal-in-delete-username-endpoint)
- [HTMLy stored XSS in image content creation functionality](https://junglewise.ai/threats/cve-2026-38949-htmly-stored-xss-in-image-content-creation-functionality)