Quick answers
- Is CVE-2026-103521 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-103521 being exploited in the wild.
- How severe is CVE-2026-103521?
- High severity, with a CVSS score of 7.2, published 12 October 2026.
- Which products and versions are affected?
- Thelia 2.6.0, 2.6.1.
- Is there a fix for CVE-2026-103521?
- 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-2026-103521 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-103521?
- Check whether you run Thelia 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 arbitrary file upload (CWE-434) in the document update endpoint. While the document upload endpoint implements file type validation, the update endpoint lacks the same checks, allowing an authenticated administrator to upload executable files such as PHP scripts. This results in remote code execution with web server privileges; no bypass of authentication is required.
Affected products
- Thelia Thelia 2.6.0, 2.6.1
Timeline
- 2026-10-12: disclosed