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CVE-2026-73381 – Authentication Bypass – Popup by Supsystic WordPress Plugin (≤ 1.13.0)

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Summary

CVE-2026-73381 is a critical unauthenticated authentication-bypass vulnerability affecting the Popup by Supsystic WordPress plugin, tracked under CWE-288 (Authentication Bypass Using an Alternate Path or Channel). It affects all plugin versions up to and including 1.13.0 and carries a CVSS v3.1 base score of 9.1 (Critical). Because the flaw requires no credentials and no user interaction, any internet-exposed WordPress site running the vulnerable plugin version is at risk.

Technical details

  • Root cause: The plugin permits authentication to be bypassed through an alternate path or channel (CWE-288), rather than through the normal login flow.
  • Trigger conditions: No authentication and no user interaction are required to exploit the flaw.
  • Attack vector: Network-based (AV:N), with low attack complexity (AC:L) and no privileges required (PR:N).
  • Impact: High impact to integrity and availability of the affected site/functionality; the vulnerability does not directly disclose confidential data (C:N) but allows unauthorized modification and disruption.

Affected software

  • Popup by Supsystic WordPress plugin, versions ≤ 1.13.0
  • Fixed in version 1.13.1 and later

Severity

  • CVSS v3.1 Base Score: 9.1 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Mitigation and recommended actions

  • Immediate: Update the Popup by Supsystic plugin to version 1.13.1 or later.
  • If no patch can be applied immediately: Restrict or disable public access to the plugin’s authentication-related endpoints, or temporarily deactivate the plugin until the update can be applied, and monitor site logs for unexpected administrative actions or configuration changes.

References

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