Quick answers
- Is CVE-2026-82599 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-82599 being exploited in the wild.
- How severe is CVE-2026-82599?
- Medium severity, with a CVSS score of 5.4, published 31 August 2026.
- Which products and versions are affected?
- Seacms up to 13.6.
- Is there a fix for CVE-2026-82599?
- 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-2026-82599 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-82599?
- Check whether you run Seacms 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
This is a path traversal vulnerability combined with arbitrary file deletion in SeaCMS 13.6's member avatar upload functionality (/member.php?action=chgpwdsubmit). The vulnerable component fails to validate or sanitize the oldpic parameter before passing it directly to PHP's unlink() function. An authenticated, low-privileged member can bypass the deletion restriction by uploading a valid image while specifying a malicious oldpic path containing traversal sequences (e.g., ../../ or absolute paths), allowing deletion of files outside the intended uploads/user/ directory. The vulnerability requires the avatar upload feature to be enabled (cfg_upic='1') and an authenticated session; no additional user interaction is required. An attacker can delete arbitrary files writable by the web process, including application files, configuration files, or other user data.
Affected products
- SeaCMS SeaCMS up to 13.6
Timeline
- 2026-08-31: disclosed
- other: Public exploit available