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CVE-2026-78262 – Unauthenticated PHP Object Injection – WP Project Manager ≤ 4.0.6

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Summary

CVE-2026-78262 is an unauthenticated PHP Object Injection (Deserialization of Untrusted Data) vulnerability affecting the WP Project Manager WordPress plugin by weDevs, versions up to and including 4.0.6. The flaw carries a CVSS v3.1 base score of 9.8 (Critical), reflecting that it can be triggered over the network by an unauthenticated attacker with no user interaction required.

Technical details

  • Root cause: The plugin deserializes untrusted, attacker-controlled input using unsafe PHP object deserialization (CWE-502), allowing crafted serialized data to be processed as PHP objects.
  • Trigger conditions: An attacker submits specially crafted serialized data to a vulnerable plugin endpoint; no authentication or user interaction is required.
  • Attack vector: Network (remotely exploitable), low attack complexity, no privileges required.
  • Impact: Successful exploitation can lead to PHP Object Injection, which — depending on other classes and gadget chains present on the target — may enable code execution, data manipulation, or denial of service, resulting in full compromise of confidentiality, integrity, and availability.

Affected software

  • WP Project Manager (weDevs) — all versions up to and including 4.0.6

Severity

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

Mitigation and recommended actions

  • Immediate: Upgrade WP Project Manager to version 4.0.7 or later, where the deserialization issue has been fixed.
  • If patching is not immediately possible: Restrict or monitor access to the plugin’s endpoints, consider disabling the plugin until patched, and use a web application firewall capable of detecting serialized PHP payloads in incoming requests.

References

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