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Deserialization of Untrusted DataWeakness · CWE-502

CVE-2025-66073

HIGH · 7.2 CVSS v3.1 Published 2025-11-21
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
78/100
Remediation priority · High
Remotely reachable 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
Deserialization of Untrusted Data vulnerability in Cozmoslabs WP Webhooks wp-webhooks allows Object Injection.This issue affects WP Webhooks: from n/a through <= 3.3.8.

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 · high confidence

A deserialization vulnerability in the WP Webhooks plugin versions up to 3.3.8 allows authenticated attackers to inject malicious PHP objects via untrusted data, potentially leading to remote code execution through PHP object injection gadgets.

MitigationUpdate WP Webhooks to the latest patched version immediately. If no update is available, restrict webhook endpoint access to trusted IPs and audit for any signs of compromise.

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
High
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:H/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. Confirm WP Webhooks plugin is installed
    Navigate to WordPress admin > Plugins, or inspect the plugins directory for wp-webhooks folder, or query the database table wp_options for option_name='active_plugins'
    Affected if WP Webhooks plugin appears in the active or installed plugins list
  2. Identify the installed version of WP Webhooks
    Check the plugin header in wp-content/plugins/wp-webhooks/plugin.php for 'Version:', or view the plugin details page in WordPress admin plugins list
    Affected if The version number is 3.3.8 or lower
  3. Verify webhook receiving endpoints are accessible
    Check plugin settings at WP Webhooks > Settings > Receive Data, or test accessing the webhook endpoint at /?rest_route=/wp-webhooks/v1/receive_data or similar publicly accessible webhook URLs defined in the plugin
    Affected if Webhook receive endpoints are enabled and publicly accessible without IP restriction
  4. Confirm attacker can obtain authenticated access
    Review WordPress user registration settings at Settings > General > Membership: Anyone can register, or audit existing user accounts with contributor or higher roles
    Affected if User registration is enabled OR there are non-admin user accounts that could be compromised

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.

From vendor data
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Update WP Webhooks to the latest patched version immediately. If no update is available, restrict webhook endpoint access to trusted IPs and audit for any signs of compromise.

Have this fixed Scoped from the published advisory
  • Consultation2.0 h
  • Implementation2.0 h
  • Testing2.0 h
  • Review / QA1.0 h
7.0 hours of engineering $1,240
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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-2025-66073 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
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