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CVE-2026-49075 – PHP Object Injection / RCE – JetEngine WordPress Plugin <= 3.8.9.1

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Summary

CVE-2026-49075 is a critical PHP Object Injection vulnerability (CWE-502: Deserialization of Untrusted Data) in the JetEngine WordPress plugin by Jetimpex Inc. (Crocoblock), affecting all versions up to and including 3.8.9.1. The official CVSS v3.1 score is 9.8 (Critical), and if a suitable PHP POP (Property-Oriented Programming) chain is present in the environment, exploitation can lead to remote code execution, SQL injection, path traversal, or denial of service. Jetimpex has released version 3.8.10 containing the fix, and all users should update immediately.

Technical details

  • Root cause: Unsafe deserialization of untrusted data within the JetEngine plugin, classified under CWE-502 (Deserialization of Untrusted Data) and CAPEC-586 (Object Injection).
  • Trigger conditions: An attacker supplies a crafted serialized PHP object to a vulnerable plugin endpoint. The plugin deserializes the payload without adequate validation. The vulnerability disclosure notes that exploitation requires Contributor-level WordPress credentials; however, the official CVSS vector records PR:N (no privileges required) — this discrepancy is present in the source record and has not yet been officially resolved. On WordPress sites with open user registration, obtaining Contributor access is trivial, materially lowering the exploitation bar regardless of which scoring is authoritative.
  • Attack vector: Network-reachable; delivered via HTTP/HTTPS requests to the WordPress installation. No user interaction is required.
  • Impact: Depending on the availability of a PHP POP chain within the target environment, successful exploitation can result in arbitrary code execution (RCE), SQL injection, path traversal, or denial of service — potentially leading to full site compromise, data exfiltration, and persistent access.

Affected software

  • JetEngine WordPress Plugin by Jetimpex Inc. (Crocoblock) — all versions <= 3.8.9.1

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 — patch: Update JetEngine to version 3.8.10 or later, which contains the vendor-issued fix. This can be done via the WordPress admin dashboard under Plugins → Update.
  • If immediate patching is not possible: Restrict access to the WordPress installation at the network or WAF layer to limit exposure. Disable open user registration to prevent unauthenticated actors from trivially obtaining Contributor-level accounts.

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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