Quick answers
- Is CVE-2026-86934 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-86934 being exploited in the wild.
- How severe is CVE-2026-86934?
- 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-2026-86934?
- A patch was published on 2026-09-23: addressed in FileMaker Server 26.0.3 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-86934 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-86934?
- 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 authorization bypass in FileMaker Server's Web Publishing Engine permits requests containing an extended privilege header to circumvent the disabled Custom Web Publishing with XML setting and gain access to the XML Web Publishing interface. The vulnerability requires network access to the Web Publishing Engine and is addressed in FileMaker Server 26.0.3 and later.
Affected products
- Claris FileMaker Server before 26.0.3
Timeline
- 2026-09-23: disclosed
- 2026-09-23: patched: addressed in FileMaker Server 26.0.3