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CVE-2026-49781 – Unauthenticated PHP Object Injection in OttoKit WordPress Plugin <= 1.1.27

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Summary

CVE-2026-49781 is a critical, unauthenticated PHP Object Injection vulnerability (CWE-502: Deserialization of Untrusted Data) in the OttoKit WordPress plugin (formerly SureTriggers) by Brainstorm Force, affecting all versions up to and including 1.1.27. It carries a CVSS 3.1 base score of 9.8 (Critical) and requires no authentication, no user interaction, and no special privileges to exploit, making any internet-exposed installation immediately at risk. The flaw was reported on 12 May 2026 by researcher daroo patched in version 1.1.28, and publicly disclosed on 15 June 2026.

Technical details

  • Root cause: The plugin deserializes untrusted, attacker-controlled input without proper validation, constituting insecure deserialization (CWE-502). An unauthenticated attacker can inject a crafted serialized PHP object into the application.
  • Trigger conditions: No authentication or prior account is required. The attack is fully remote and can be triggered by any network-accessible attacker against an unpatched installation.
  • Attack vector: Network-based; low complexity, no privileges required, no user interaction needed (CVSS:3.1/AV:N/AC:L/PR:N/UI:N).
  • Impact: Successful exploitation — contingent on the presence of a suitable POP (Property-Oriented Programming) chain in the environment — can enable code injection, SQL injection, path traversal, and denial of service. Exploitation can allow attackers to execute arbitrary code, manipulate the WordPress database, and access restricted file paths, resulting in full confidentiality, integrity, and availability compromise (C:H/I:H/A:H).

Affected software

  • OttoKit WordPress Plugin (plugin slug: suretriggers) by Brainstorm Force — all versions <= 1.1.27

Severity

  • CVSS v3.1 Base Score: 9.8 (Critical)
  • Vector String: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate — apply the patch: Upgrade the OttoKit plugin to version 1.1.28 or later. The fix was released on 26 May 2026 and is available via the WordPress plugin repository. Version 1.1.28 is confirmed by the vendor’s official changelog to address this security issue.
  • If patching is not immediately possible: Temporarily deactivate the OttoKit plugin until the update can be applied. Restrict network access to the WordPress admin and REST API endpoints via firewall or WAF rules to limit exposure.
  • OttoKit currently has 90,000+ active installations according to the WordPress plugin repository. Given the plugin’s history of rapid exploitation following previous vulnerability disclosures, organizations running any version <= 1.1.27 should treat this as an emergency remediation.

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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