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PatchSiren cyber security CVE debrief

CVE-2026-42682 Tomdever CVE debrief

A critical missing authorization vulnerability in wpForo Forum allows unauthenticated attackers to exploit incorrectly configured access control security levels. The vulnerability affects versions from n/a through 3.0.6 and has been assigned a CVSS 3.1 score of 9.1 (Critical). The issue was published in the NVD on June 1, 2026, with a status of 'Received'. The underlying weakness is CWE-862 (Missing Authorization), indicating that the software does not perform an authorization check when an actor attempts to access a resource or perform an action. The CVSS vector (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H) indicates network attack vector, low attack complexity, no privileges required, no user interaction, and high impact to integrity and availability with no confidentiality impact. The vendor attribution is currently uncertain, with Patchstack identified as a reference domain candidate and the vendor marked as requiring review. No known exploitation in ransomware campaigns has been documented, and this CVE is not listed in CISA's Known Exploited Vulnerabilities catalog.

Vendor
Tomdever
Product
wpForo Forum
CVSS
CRITICAL 9.1
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-01
Original CVE updated
2026-06-01
Advisory published
2026-06-01
Advisory updated
2026-06-01

Who should care

WordPress site administrators running wpForo Forum plugin versions 3.0.6 or earlier; security teams responsible for WordPress plugin vulnerability management; web application firewall operators; managed WordPress hosting providers; and organizations using wpForo for community or support forum functionality.

Technical summary

CVE-2026-42682 is a critical missing authorization (CWE-862) vulnerability in the wpForo Forum WordPress plugin, affecting versions through 3.0.6. The vulnerability allows remote, unauthenticated attackers to bypass access controls due to incorrectly configured security levels. With a CVSS 3.1 score of 9.1 (Critical), the issue presents high integrity and availability impact with no confidentiality impact. The attack requires no privileges or user interaction and is exploitable over the network with low complexity. The underlying weakness suggests that certain functionality intended to be restricted to authorized users lacks proper capability or role verification, a common pattern in WordPress plugins where AJAX actions or REST endpoints fail to implement current_user_can() checks or nonce validation. The vendor field indicates uncertainty requiring review, with Patchstack serving as the primary reference source. The NVD entry status is 'Received', indicating initial processing. No known active exploitation or ransomware campaign use has been documented at this time.

Defensive priority

critical

Recommended defensive actions

  • Upgrade wpForo Forum to a version newer than 3.0.6 as soon as a patched release becomes available.
  • Verify that all access control checks are properly enforced for forum administrative and moderation functions, particularly those exposed via AJAX endpoints or REST API routes.
  • Review WordPress capability checks and nonce verification in wpForo code to ensure unauthenticated users cannot trigger privileged operations.
  • Monitor web server and WordPress audit logs for anomalous requests to wpForo endpoints that may indicate access control bypass attempts.
  • Apply principle of least privilege to WordPress user roles interacting with wpForo functionality.
  • If immediate patching is not possible, consider implementing a Web Application Firewall (WAF) rule to restrict access to sensitive wpForo administrative endpoints.

Evidence notes

The CVE description explicitly states 'Missing Authorization vulnerability in Tomdever wpForo Forum allows Exploiting Incorrectly Configured Access Control Security Levels' affecting versions 'from n/a through 3.0.6'. The NVD entry shows vulnStatus 'Received' and includes a Patchstack reference. CWE-862 is identified as the primary weakness. CVSS 3.1 vector confirms network-accessible, unauthenticated attack with high integrity and availability impact. Vendor confidence is low with needsReview flag set to true; canonical source is reference_domain_weak with Patchstack as the reference domain candidate.

Official resources

2026-06-01T15:16:36.003Z