Remote Code Execution Vulnerability in The Events Calendar Plugin for WordPress
CVE-2026-78159

9.8CRITICAL

Key Information:

Vendor

WordPress
Status
The Events Calendar
Vendor
CVE Published:
12 September 2026

What is CVE-2026-78159?

The Events Calendar plugin for WordPress suffers from a vulnerability that allows unauthenticated attackers to execute arbitrary code on the server. This is primarily due to insufficient input validation of the 'classes' map within the parse_array function. When comments are enabled on tribe_events posts, attackers can trigger the vulnerability by submitting a crafted comment containing a wp:legacy-widget block. This malicious payload bypasses safety checks and reaches a vulnerable execution point in the code, enabling unauthorized command execution. Website administrators should ensure this plugin is updated to mitigate risks associated with this vulnerability.

Affected Version(s)

The Events Calendar 0 <= 6.17.3

References

https://www.wordfence.com/threat-intel/vulnerabilities/id...
https://plugins.trac.wordpress.org/browser/the-events-cal...
https://plugins.trac.wordpress.org/browser/the-events-cal...

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

Chloe Chamberland
Wordfence Argus
.