# CVE-2026-96739: SEMCMS unauthenticated file upload in KindEditor interface

Source: https://junglewise.ai/threats/cve-2026-96739-a-flaw-has-been-found-in-semcms-up-to-4-2-affected-by-this-issue  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-24. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-96739 · Severity: medium · CVSS 4.3 · Published 2026-09-24

SEMCMS is a PHP-based content management system used for multilingual websites. An unauthenticated attacker can upload HTML files to the server without logging in, which are then stored in a web-accessible directory and executed as part of the website domain. This allows attackers to run malicious JavaScript under the website's domain, potentially stealing user sessions, modifying page content, or harvesting sensitive data from logged-in administrators.

Technologies: [SEMCMS](https://junglewise.ai/threats/technologies/semcms). Vendors: [SEMCMS](https://junglewise.ai/threats/vendors/semcms).

## Quick answers

**Is CVE-2026-96739 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-96739 being exploited in the wild.

**How severe is CVE-2026-96739?** Medium severity, with a CVSS score of 4.3, published 24 September 2026.

**Which products and versions are affected?** SEMCMS up to 4.2.

**Is there a fix for CVE-2026-96739?** 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-2026-96739 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-96739?** Check whether you run SEMCMS 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

The vulnerability is an unauthenticated file upload combined with stored cross-site scripting (XSS) in the /Edit/php/upload_json.php endpoint (KindEditor Upload Interface). The upload handler accepts the imgFile parameter without validating user authentication or file type, allowing HTML files to be uploaded and served as text/html from a web-accessible directory (/Images/attached/file/). An attacker can craft a POST request to upload an HTML file containing JavaScript, which executes when the file is accessed.

## Affected products

- SEMCMS SEMCMS up to 4.2

## Timeline

- 2026-07-24: disclosed
- 2026-09-24: advisory

## References

- [https://github.com/CSDVi/cve/issues/7](https://github.com/CSDVi/cve/issues/7)
- [https://vuldb.com/cve/CVE-2026-96739](https://vuldb.com/cve/CVE-2026-96739)

## Related threats

- [SEMCMS SQL injection in SEMCMS_Banner.php](https://junglewise.ai/threats/cve-2026-108814-a-flaw-has-been-found-in-semcms-up-to-5-0-this-impacts-an)
- [SEMCMS improper authorization in user deletion](https://junglewise.ai/threats/cve-2026-108812-a-security-vulnerability-has-been-detected-in-semcms-up-to-5-0)
- [SemCms CSRF in admin user management module](https://junglewise.ai/threats/cve-2026-39170-semcms-csrf-in-admin-user-management-module)
- [SEMCMS unauthenticated database export in SEMCMS_copy.php](https://junglewise.ai/threats/cve-2026-39169-semcms-unauthenticated-database-export-in-semcms-copy-php)
- [SemCms SQL injection in SEMCMS_Products.php](https://junglewise.ai/threats/cve-2025-51660-semcms-sql-injection-in-semcms-products-php)