Quick answers
- Is CVE-2026-89435 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-89435 being exploited in the wild.
- How severe is CVE-2026-89435?
- High severity, with a CVSS score of 8.8, published 30 October 2026.
- Which products and versions are affected?
- Formidable Forms up to and including 6.35.
- Is there a fix for CVE-2026-89435?
- 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-2026-89435 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-89435?
- Check whether you run Formidable Forms 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 exists in the validate_url_is_in_s3_bucket() function due to insufficient URL prefix validation on the 'file_url' parameter. The affected REST API endpoint uses a permission callback that checks only for the frm_view_forms capability—which any subscriber-level user can obtain—rather than enforcing install_plugins or activate_plugins capabilities. Authenticated attackers can exploit this to install arbitrary plugins when Formidable Pro is not installed.
Affected products
- Formidable Formidable Forms up to and including 6.35
Timeline
- 2026-10-30: disclosed