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TI-2026-82949 Aliases CVE-2026-89435GHSA-7366-rqfr-5w7j

Arbitrary plugin installation in Formidable Forms for WordPress

Priority MEDIUM 40CWE-74Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA.

Summary

The Formidable Forms plugin for WordPress is affected through 6.35. Insufficient URL prefix validation in validate_url_is_in_s3_bucket() and a permission check that relies only on a shared token let any user with the frm_view_forms capability reach plugin installation. An authenticated attacker with subscriber-level access or higher can install arbitrary plugins on the server when Formidable Pro is not installed.

Written with Claude Haiku 5.5 from the sources below · 2026-11-05

Description from the CNA

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).

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00392 33rd percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
strategy11teamFormidable Forms – Contact Form, Survey, Quiz, Payment, Calculator Form & Custom Form Builderup to 6.35—No fix listedCNA
  • Formidable Forms – Contact Form, Survey, Quiz, Payment, Calculator Form & Custom Form Builder Vendorstrategy11team Affected up to 6.35 Fixed in — No fix listed CNA

Remediation

The sources list no fixed version for Formidable Forms (Contact Form, Survey, Quiz, Payment, Calculator Form & Custom Form Builder).

Written with Claude Haiku 5.5 from the sources below · 2026-11-05

Timeline

  1. 2026-10-30 Threatist record created from CVE-2026-89435
  2. 2026-10-30 Alias added: GHSA-7366-rqfr-5w7j
  3. 2026-10-30 CISA SSVC decision points changed
  4. 2026-10-30 Priority changed: MEDIUM → LOW
  5. 2026-10-31 Priority changed: LOW → MEDIUM

References

Other 8

  • TI-2022-03006 AWP Classifieds Plugin < 4.3 - Unauthenticated SQLi CVSS 3.1CRITICAL 9.8
  • TI-2023-02696 Formidable Forms < 6.3.1 - Subscriber+ Remote Code Execution CVSS 3.1HIGH 8.8
  • TI-2023-01329 Formidable Forms < 6.2 - Unauthenticated PHP Object Injection CVSS 3.1HIGH 7.5
  • TI-2023-00774 Formidable Forms < 6.1 - IP Spoofing CVSS 3.1MEDIUM 6.5
  • TI-2024-09065 Formidable Forms < 6.14.1 - Admin+ Stored XSS CVSS 3.1MEDIUM 4.8
  • TI-2024-04133 SQL injection in strategy11team Business Directory Plugin – Easy Listing Directories for… CVSS 3.1CRITICAL 9.8
See all 40 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences