CVE-2026-49767 Overview
CVE-2026-49767 is a broken authentication vulnerability affecting the wpForo Forum plugin for WordPress in versions 3.1.0 and earlier. The flaw allows unauthenticated attackers to bypass authentication controls over the network without user interaction. The weakness is classified under [CWE-288: Authentication Bypass Using an Alternate Path or Channel].
Successful exploitation can compromise confidentiality, integrity, and availability of the affected WordPress site. Because wpForo manages forum users, posts, and moderation, an authentication bypass can give attackers unauthorized access to forum functions and potentially privileged accounts.
Critical Impact
Unauthenticated attackers can bypass authentication in wpForo Forum <= 3.1.0, potentially gaining access to protected forum operations and user accounts on affected WordPress installations.
Affected Products
- WordPress wpForo Forum plugin versions <= 3.1.0
- WordPress installations with the wpForo plugin enabled
- Sites exposing wpForo endpoints to the public internet
Discovery Timeline
- 2026-06-17 - CVE-2026-49767 published to the National Vulnerability Database (NVD)
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2026-49767
Vulnerability Analysis
The vulnerability resides in the authentication logic of the wpForo Forum plugin. According to the Patchstack advisory, the plugin contains a broken authentication flaw that allows unauthenticated actors to access protected functionality without supplying valid credentials.
The attack requires no privileges and no user interaction. An attacker only needs network access to a WordPress site running the vulnerable plugin. Broken authentication weaknesses of this type typically arise from missing capability checks, improper nonce validation, or alternate code paths that skip identity verification entirely.
The Exploit Prediction Scoring System currently places exploitation likelihood in the lower-mid range, but the lack of preconditions makes opportunistic scanning highly likely once a public proof of concept emerges.
Root Cause
The root cause is mapped to [CWE-288], indicating that the plugin exposes a code path which performs sensitive actions without enforcing authentication. This may include REST routes, AJAX handlers, or form submission endpoints that fail to validate the requesting user before executing privileged logic.
Attack Vector
The attack vector is network-based. An attacker sends crafted HTTP requests to the vulnerable WordPress endpoint exposed by wpForo. Because no authentication, privileges, or user interaction are required, exploitation can be performed remotely and at scale against any internet-facing site running the affected plugin version.
No verified public exploit code is available at the time of writing. Refer to the Patchstack advisory for additional technical context.
Detection Methods for CVE-2026-49767
Indicators of Compromise
- Unexpected administrative or moderator actions in wpForo logs originating from unauthenticated sessions
- New or modified forum user accounts without corresponding registration events in WordPress audit logs
- HTTP requests to wpForo endpoints (paths containing wpforo or wpf-) from unfamiliar IP addresses immediately followed by privileged state changes
- Sudden spikes in failed or anomalous authentication-related responses from /wp-admin/admin-ajax.php referencing wpForo actions
Detection Strategies
- Inventory WordPress sites and identify any running wpForo Forum at version 3.1.0 or earlier
- Inspect web server access logs for repeated requests to wpForo REST or AJAX endpoints from a single source
- Correlate WordPress user role changes with the authenticated session that initiated them; flag mismatches
- Use file integrity monitoring to detect unauthorized changes to plugin files or the WordPress wp_users and wp_usermeta tables
Monitoring Recommendations
- Forward WordPress, PHP, and web server logs to a centralized analytics platform for correlation
- Alert on wpForo-related HTTP requests that succeed with 2xx responses but originate from sessions without an active wordpress_logged_in_* cookie
- Monitor for outbound connections from the web host immediately after wpForo endpoint access, which may indicate post-exploitation activity
How to Mitigate CVE-2026-49767
Immediate Actions Required
- Identify all WordPress instances running wpForo Forum <= 3.1.0 across the environment
- Update wpForo Forum to a fixed version as soon as the vendor publishes a patched release
- If immediate patching is not possible, deactivate the wpForo plugin until a fix is applied
- Rotate credentials for WordPress administrators and forum moderators on potentially exposed sites
Patch Information
A fixed version was not specified in the available NVD data at the time of publication. Consult the Patchstack advisory and the official wpForo plugin page on wordpress.org for the latest patched release and upgrade instructions.
Workarounds
- Restrict access to the WordPress site using a web application firewall (WAF) rule that blocks unauthenticated requests to wpForo endpoints
- Place the affected site behind authentication at the reverse proxy or CDN layer while a patch is pending
- Temporarily disable forum registration and limit forum routes to authenticated users via server-side access control
- Remove the wpForo plugin entirely on sites where the forum feature is not actively required
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
