Quick answers
- Is CVE-2026-86930 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-86930 being exploited in the wild.
- How severe is CVE-2026-86930?
- Critical severity, with a CVSS score of 9.1, published 23 September 2026.
- Which products and versions are affected?
- Claris FileMaker Server before 26.0.3.
- Is there a fix for CVE-2026-86930?
- 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-2026-86930 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-86930?
- Check whether you run Claris FileMaker Server 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
An out-of-bounds read vulnerability exists in FileMaker Server's image processing logic during thumbnail generation in WebDirect. The vulnerability is triggered by uploading a specially crafted image file to a container field; no authentication bypass or additional preconditions are mentioned. Successful exploitation results in disclosure of process memory contents.
Affected products
- Claris FileMaker Server before 26.0.3
Timeline
- 2026-09-23: disclosed