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Deserialization of Untrusted DataWeakness · CWE-502

CVE-2026-24989

CRITICAL · 9.8 CVSS v3.1 Published 2026-03-25
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
Deserialization of Untrusted Data vulnerability in FantasticPlugins SUMO Affiliates Pro affs allows Object Injection.This issue affects SUMO Affiliates Pro: from n/a through < 11.4.0.

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

This is a PHP Object Injection vulnerability caused by unsafe deserialization of untrusted data in the SUMO Affiliates Pro plugin. The vulnerability allows attackers to inject malicious PHP objects via serialized data, potentially leading to remote code execution if magic methods are present in the application or its dependencies.

MitigationUpgrade to SUMO Affiliates Pro version 11.4.0 or later to receive the patch that properly validates or sanitizes deserialized data.

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 the SUMO Affiliates Pro plugin version
    Access your WordPress installation via FTP or file manager, navigate to /wp-content/plugins/sumo-affiliates-pro/, and open the main plugin file (usually sumofaffiliates.php or similar) to find the version declaration in the plugin header comment
    Affected if The version number found is lower than 11.4.0
  2. Check plugin version via WordPress admin
    Log into the WordPress admin dashboard, go to Plugins > Installed Plugins, find SUMO Affiliates Pro in the list, and note the version number displayed beneath the plugin name
    Affected if The displayed version is below 11.4.0
  3. Verify plugin is active and processing user data
    In WordPress admin, confirm SUMO Affiliates Pro is activated. Then check if the plugin is configured to handle affiliate data submissions, as the vulnerability requires the plugin to receive and deserialize untrusted serialized data
    Affected if The plugin is active and accepts serialized affiliate/lead data submissions from users
  4. Inspect plugin files for unsafe deserialization usage
    Using a code search tool or grep, search within the SUMO Affiliates Pro plugin directory for patterns like 'unserialize(' and 'base64_decode(' in combination, which indicate the vulnerable data handling pattern described in the CVE
    Affected if The plugin contains unserialize() calls processing data without prior validation, and the plugin version is below 11.4.0

You are affected if SUMO Affiliates Pro is installed and active with a version lower than 11.4.0, and the plugin processes serialized data from user submissions.

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

Upgrade to SUMO Affiliates Pro version 11.4.0 or later to receive the patch that properly validates or sanitizes deserialized data.

Recommended fix Moderate confidence

SUMO Affiliates Pro version 11.4.0 or later

  1. 1. Backup your WordPress site and database before making any changes
  2. 2. Navigate to Plugins > Installed Plugins in your WordPress admin dashboard
  3. 3. Locate SUMO Affiliates Pro in the plugin list
  4. 4. If an update is available, click 'Update Now' to update to version 11.4.0 or later
  5. 5. Alternatively, download the latest version from the official WordPress plugin repository or from FantasticPlugins
  6. 6. Deactivate and delete the old version if auto-update doesn't work, then install the new version
  7. 7. Verify the installed version is 11.4.0 or higher after updating
  8. 8. Test critical affiliate tracking functionality to ensure the update didn't break existing features

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

Have this fixed Scoped from the published advisory
  • Consultation4.0 h
  • Implementation3.0 h
  • Testing4.0 h
  • Review / QA2.0 h
13.0 hours of engineering $2,300
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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-2026-24989 in production — separate from our analysis above.

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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