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CVE-2026-56031 – Unauthenticated PHP Object Injection – Uncanny Automator WordPress Plugin ≤ 7.3.1.2

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Summary

CVE-2026-56031 is a high-severity, unauthenticated PHP Object Injection vulnerability affecting the Uncanny Automator WordPress plugin (by Uncanny Owl) in all versions up to and including 7.3.1.2. The flaw arises from insufficient protection against deserialization of untrusted data when processing user-submitted trigger token values, and carries a CVSS v3.1 base score of 8.1 (HIGH). Successful exploitation — where a suitable Property-Oriented Programming (POP) chain exists in the target environment — can result in remote code execution, arbitrary file manipulation, or full site compromise.

Technical details

  • Root cause: The plugin fails to adequately sanitize or validate user-submitted trigger token values before passing them to PHP’s deserialization routines (CWE-502: Deserialization of Untrusted Data). Specific integrations affected include the plugin’s handling of trigger token data in WPForms, MailPoet, and FunnelKit (Autonami) workflows.
  • Trigger conditions: An unauthenticated attacker can deliver a crafted, serialized PHP object payload through an affected trigger token input. No account, session, or victim interaction is required.
  • Attack vector: Remotely exploitable over the network (AV:N) with no privileges required (PR:N) and no user interaction (UI:N). Attack complexity is rated High (AC:H), reflecting that exploitation depends on the presence of a usable POP chain within the target WordPress environment’s installed codebase.
  • Impact: If a valid POP chain is available, exploitation can yield remote code execution (RCE), arbitrary file read/write/deletion, sensitive data exfiltration, or complete site takeover. CVSS impact subscores are High across Confidentiality, Integrity, and Availability (C:H/I:H/A:H).

Affected software

  • Uncanny Automator (free/lite) — all versions ≤ 7.3.1.2
  • Uncanny Automator Pro — all versions ≤ 7.3.1.2

Severity

  • CVSS v3.1 Base Score: 8.1 (HIGH)
  • Vector String: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate action — update the plugin: Upgrade Uncanny Automator (free and Pro) to version 7.3.1.3 or later, which contains Uncanny Owl’s fix for this vulnerability. Updates are available through the official WordPress plugin updater in your dashboard or through the WordPress.org plugin repository. Do not install plugin builds from unofficial sources.
  • Audit your WordPress environment: Assess which other plugins are installed alongside Uncanny Automator, as the availability of a POP chain is determined by the broader plugin/theme codebase present on each site. Even in the absence of a known public exploit, environments with complex plugin sets carry elevated risk.
  • Network mitigation (if immediate patching is not feasible): Restrict public access to WordPress endpoints that process trigger token data, or place the WordPress installation behind a Web Application Firewall (WAF) configured to detect and block PHP deserialization payloads.

IONIX Status

The IONIX research team is tracking ongoing exploitation attempts and recommends immediate patching. Potentially affected assets are outlined in this post.

References

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