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CVE-2026-42682 – Unauthenticated Broken Access Control – WordPress wpForo Forum Plugin ≤ 3.0.6

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Summary

CVE-2026-42682 is a Missing Authorization (Broken Access Control) vulnerability in the WordPress wpForo Forum plugin, affecting all versions through 3.0.6. The flaw stems from a missing authorization check in a privileged function, allowing unauthenticated remote attackers to execute higher-privilege actions without any credentials or user interaction. With a CVSS v3.1 base score of 9.1 (Critical), this vulnerability poses a severe risk to any internet-facing WordPress site running an affected version of the plugin.

Technical details

  • Root cause: A missing authorization, authentication, or nonce token check in a function that handles a privileged operation within the wpForo Forum plugin, allowing an unprivileged, unauthenticated user to invoke actions that should require elevated permissions.
  • Trigger conditions: No authentication, account, or special configuration is required. The attack can be carried out remotely over the network with no user interaction and low complexity.
  • Attack vector: Network-accessible; unauthenticated; no privileges required; no user interaction required; low attack complexity.
  • Impact: High integrity impact — unauthenticated attackers can perform unauthorized modifications to forum content or settings; High availability impact — the vulnerability can be leveraged to disrupt forum service. No confidentiality impact is indicated.

Affected software

  • WordPress wpForo Forum Plugin, all versions from n/a through 3.0.6 (inclusive)

Severity

  • CVSS v3.1 Base Score: 9.1 (Critical)
  • Vector String: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Mitigation and recommended actions

  • Immediate: Update the wpForo Forum plugin to version 3.0.7 or later. Version 3.0.7 (released 23 April 2026) contains the security fix for this vulnerability; the current latest version is 3.1.1.
  • If immediate patching is not possible, restrict public access to the WordPress site’s forum endpoints at the web application firewall or network perimeter level until the plugin can be updated.

IONIX Status

The IONIX research team is tracking ongoing exploitation attempts and recommends immediate patching. Potentially affected assets are outlined in this post.

References

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How IONIX’s External Exposure Management Platform Detects and Validates
Zero-Days to Shrink MTTR

1

Map your entire attack surface (continously)

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