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Deserialization of Untrusted DataWeakness · CWE-502

CVE-2026-49769

CRITICAL · 9.8 CVSS v3.1 Published 2026-06-15
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
100/100
Remediation priority · Urgent
Remotely reachable No privileges Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
Unauthenticated PHP Object Injection in wpForo Forum <= 3.1.0 versions.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · moderate confidence

Unauthenticated PHP Object Injection vulnerability in wpForo Forum plugin versions 3.1.0 and below allows remote attackers to deserialize untrusted data without authentication, potentially leading to remote code execution.

MitigationUpdate wpForo Forum to a version newer than 3.1.0 or apply available vendor security patches immediately.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Locate wpForo Forum plugin installation
    Check the WordPress plugins directory (wp-content/plugins/) for a folder named 'wpforo' or 'wpforo-forum'). Also check the WordPress admin dashboard under Plugins to see if wpForo Forum is listed as an installed plugin.
    Affected if The wpForo Forum plugin folder exists in the WordPress plugins directory or is listed in the WordPress admin plugins list.
  2. Determine installed wpForo version
    Open the main plugin file (usually wp-content/plugins/wpforo/wpforo.php or wp-content/plugins/wpforo-forum/wpforo.php) and look for the 'Version' header in the plugin comment block at the top of the file. Alternatively, check the readme.txt file in the plugin folder for the 'Stable tag' or 'Version' entry.
    Affected if The version listed is 3.1.0 or any version lower than 3.1.0.
  3. Verify WordPress site is publicly accessible
    Confirm that the WordPress site is accessible over the network (not localhost-only or behind a firewall that blocks external requests). Attempt to access the homepage from an external location or verify the site URL resolves publicly.
    Affected if The WordPress site is reachable from the internet or untrusted networks.
  4. Confirm no authentication requirement on wpForo endpoints
    Test accessing wpForo forum pages (such as the main forum URL) without logging in. The vulnerability states it is exploitable without authentication, so if the forum is publicly viewable without being logged in, the attack surface exists.
    Affected if Forum pages are accessible to unauthenticated (not logged-in) users.

A WordPress installation with wpForo Forum plugin version 3.1.0 or below that is publicly accessible with unauthenticated forum access is affected by this vulnerability.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Update wpForo Forum to a version newer than 3.1.0 or apply available vendor security patches immediately.

Recommended fix Moderate confidence

wpForo Forum 3.1.1 or later

  1. 1. Back up your WordPress site and database before making any changes
  2. 2. Update wpForo Forum plugin to the latest available version through WordPress admin dashboard (Plugins > wpForo Forum > Update Now)
  3. 3. Alternatively, download the latest version from wordpress.org and upload via FTP if automatic update fails
  4. 4. Verify the update was successful by checking the plugin version in WordPress admin
  5. 5. Test core forum functionality (posting, replying, user registration) to ensure the update did not break existing features
Caveat Review plugin changelog for any breaking changes between 3.1.0 and the target version before upgrading

Generated from the published advisory — verify against the referenced sources before acting.

Have this fixed Scoped from the published advisory
  • Consultation4.0 h
  • Implementation2.0 h
  • Testing4.0 h
  • Review / QA2.0 h
12.0 hours of engineering $2,120
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An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,392.

Scan for this in your stack

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-49769 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data