Unauthenticated PHP Object Injection in Popup by Supsystic Plugin
CVE-2026-73380

9.8CRITICAL

Key Information:

Vendor

WordPress
Status
Popup By Supsystic
Vendor
CVE Published:
18 August 2026

What is CVE-2026-73380?

This vulnerability allows unauthenticated attackers to exploit a PHP Object Injection flaw in the Popup by Supsystic plugin version 1.13.0. By manipulating serialized data, attackers can potentially execute arbitrary PHP code, leading to unauthorized access, data manipulation, or system compromise. It is crucial for users of the affected version to apply the latest security updates or patches to mitigate this risk.

Affected Version(s)

Popup by Supsystic <= 1.13.0

References

https://patchstack.com/database/wordpress/plugin/popup-by...
vdb-entry

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Asim Alshaya | Patchstack Bug Bounty Program
.