CVE-2026-89435
The Formidable Forms – WordPress Form Builder for Contact Forms, Calculators, Quizzes & More plugin for WordPress is vulnerable to Arbitrary Plugin Installation in all versions up to, and including, 6.35 via the 'file_url' parameter parameter. This is due to insufficient URL prefix validation in validate_url_is_in_s3_bucket() and a permission callback that relies solely on a shared token obtainable by any user with the delegable frm_view_forms capability, without checking install_plugins or activate_plugins capabilities. This makes it possible for authenticated attackers, with subscriber-level access and above, to install arbitrary plugins on the server. Exploitation additionally requires that the site is free-only (Formidable Pro is NOT installed).
Properties
- Severity
- HIGH
- Nvd fetched at
- 2026-10-30T07:58:06.356713+00:00
- Cvss severity
- HIGH
- Cvss score
- 8.8
- Retrieved at
- 2026-10-30T07:59:21+00:00
- Score
- 8.8
- Cvss version
- 3.1
- Last source
- NVD
- Cve id
- CVE-2026-89435
- Cvss vector
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- First seen by Signal
- 2026-10-30T07:59:21+00:00
- Vector
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Published at
- 2026-10-30T07:16:34.410
- Last modified
- 2026-10-30T07:16:34.410
Related Entities (1)
HAS_WEAKNESS (1)
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