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CRITICAL

CVE-2026-78006

The Events Calendar <= 6.17.4 - Unauthenticated PHP Object Injection to Remote Code Execution

CVSS v3

9.8

CRITICAL

EPSS Score

1.5 %

exploit probability, as of 2026-09-25

CISA KEV

No

known exploited

Exploitation

—

SSVC status

Description

The The Events Calendar plugin for WordPress is vulnerable to Remote Code Execution in all versions up to, and including, 6.17.4 via the is_safe_widget_instance function. This is due to insufficient protection in is_safe_widget_instance, which can be bypassed because PHP fires magic methods during its pre-parse, combined with enable_rendering_widget_copied() forging a valid wp_hash integrity attribute before unserialize() is reached. This makes it possible for unauthenticated attackers to execut

Technical details

Published
2026-09-12
Last Modified
2026-09-12

Frequently asked questions

What is CVE-2026-78006?

The The Events Calendar plugin for WordPress is vulnerable to Remote Code Execution in all versions up to, and including, 6.17.4 via the is_safe_widget_instance function. This is due to insufficient protection in is_safe_widget_instance, which can be bypassed because PHP fires magic methods during its pre-parse, combined with enable_rendering_widget_copied() forging a valid wp_hash integrity attribute before unserialize() is reached. This makes it possible for unauthenticated attackers to execut

Is CVE-2026-78006 actively exploited?

Active exploitation of CVE-2026-78006 has not been confirmed. Its EPSS score was 1.5% on 2026-09-25, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-78006?

CVE-2026-78006 has a CVSS v3 base score of 9.8 (CRITICAL severity).

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