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CVE-2026-90888 – Unauthenticated PHP Object Injection – LeadSnap WordPress Plugin <= 1.25

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Summary

CVE-2026-90888 is an unauthenticated PHP Object Injection vulnerability (CWE-502, Deserialization of Untrusted Data) in the LeadSnap WordPress plugin. It affects versions 1.25 and earlier. The CVE record rates it Critical, with a CVSS v3.1 base score of 9.8.

Technical details

  • Root cause: deserialization of untrusted data (CWE-502 / CAPEC-586 Object Injection) in the LeadSnap plugin.
  • Trigger conditions: no authentication or user interaction is required.
  • Attack vector: network, low attack complexity.
  • Impact: the CVE record rates confidentiality, integrity and availability impact as High. The record does not describe a specific exploit chain or gadget.
  • The vulnerability was reported by Ananda Dhakal via the Patchstack Bug Bounty Program, and the CVE was published on October 30, 2026.

Affected software

  • LeadSnap WordPress plugin versions <= 1.25

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: the CVE record lists no fixed version. Check the plugin vendor for an update, and apply it once one is released.
  • If no patch is available: deactivate and remove the LeadSnap plugin, or replace it, until a fixed release is published.
  • Consider restricting access to the plugin’s endpoints, for example with a WAF rule, and review web logs for suspicious serialized payloads.

References

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