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