WORDPRESS · SEPTEMBER 2026 · EARLY WARNING

The Events Calendar WordPress Plugin Vulnerable to Remote Code Execution

EARLY WARNING · UNCONFIRMED. This page describes a developing threat that 0Day surfaced from early signals and has not yet independently confirmed. Details may change. Always verify against the primary sources before acting.
Severity
CRITICAL
CVSS
9.8
Affected component
the events calendar plugin (wordpress)
Patched version
Not yet available
CVE-2026-78006

The Events Calendar plugin for WordPress appears to be vulnerable to Remote Code Execution in all versions up to, and including, 6.17.4. This vulnerability is due to insufficient protection in the is_safe_widget_instance function.

What happened

The Events Calendar plugin for WordPress is under investigation for a critical vulnerability that could allow Remote Code Execution. This vulnerability, tracked as CVE-2026-78006, is present in all versions up to, and including, 6.17.4. The issue arises from insufficient protection in the is_safe_widget_instance function, which can be exploited by unauthenticated attackers to execute code on the server.

This vulnerability was first flagged on 2026-09-12T08:16:24.240000+00:00 and has a CVSS score of 9.8, indicating a critical severity level. There is no evidence at this time that this vulnerability has been exploited in the wild.

What to do about it

How 0Day would have caught this

MATCHED TO YOUR ACTUAL DEPENDENCY GRAPH0Day matches every incoming threat signal against your GitHub organization’s full dependency graph, including transitive dependencies. If the events calendar plugin is anywhere in your dependency tree, the engineers who own the affected repositories get a push alert the moment it is flagged — no manual audit to remember to run.

Read how this differs from waiting on a scanner to catch a known advisory, or see the exact, read-only access 0Day needs to do this for an organization.

Frequently asked questions

Am I affected?

If you are using The Events Calendar plugin for WordPress in version 6.17.4 or earlier, you may be affected by this vulnerability.

What should I do right now?

Upgrade to a version beyond 6.17.4 of The Events Calendar plugin and review your server logs for any suspicious activity.

Is there an official fix available?

No official fix has been published yet. Monitor the primary sources for updates.

Sources

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