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CVE-2026-82226 – Unauthenticated PHP Object Injection – Tickera WordPress Plugin ≤ 3.6.0.2

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Summary

CVE-2026-82226 is an unauthenticated PHP Object Injection (Deserialization of Untrusted Data, CWE-502) vulnerability in the Tickera WordPress Event Ticketing System plugin, affecting all versions up to and including 3.6.0.2. The flaw allows a remote, unauthenticated attacker to submit crafted serialized data that the plugin unsafely deserializes, potentially leading to code execution, data manipulation, or other object-injection side effects. The issue carries a CVSS v3.1 base score of 9.8 (Critical).

Technical details

  • Root cause: the plugin deserializes attacker-supplied input without proper validation, enabling PHP Object Injection (CAPEC-586).
  • Trigger conditions: no authentication or user interaction is required to exploit the vulnerability.
  • Attack vector: Network — exploitable remotely over HTTP(S) against any internet-exposed site running the vulnerable plugin.
  • Impact: successful exploitation can affect confidentiality, integrity, and availability of the affected WordPress site, with high impact rated across all three (C:H/I:H/A:H). Depending on gadget chains present in the environment, this can lead to remote code execution, data theft, or site takeover.

Affected software

  • Tickera – Sell Tickets & Manage Events (tickera-event-ticketing-system) WordPress plugin, versions up to and including 3.6.0.2

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: Update the Tickera WordPress plugin to version 3.6.0.3 or later, which resolves the object injection issue.
  • If immediate patching is not possible: restrict or monitor unauthenticated access to the plugin’s endpoints, deploy a web application firewall rule to block requests containing serialized PHP object payloads, and review site logs for anomalous POST requests targeting Tickera endpoints.
  • Following the update, verify plugin version via the WordPress admin dashboard and confirm no unauthorized changes occurred during the exposure window.

References

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