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 execute code on the server. This is exploitable without authentication or approval because the plugin's V2 single-event template runs do_blocks() over buffered comment HTML, and WordPress returns a moderation-hash URL that allows an unauthenticated commenter to immediately view their own pending comment, delivering the injected block markup to the vulnerable code path before any moderation occurs. This does require comments to be enabled and visible on events.
Published: 2026-09-12
Score: 9.8 Critical
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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History

Mon, 14 Sep 2026 21:00:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Sun, 13 Sep 2026 06:30:00 +0000

Type Values Removed Values Added
First Time appeared Stellarwp
Stellarwp the Events Calendar
Wordpress
Wordpress wordpress
Vendors & Products Stellarwp
Stellarwp the Events Calendar
Wordpress
Wordpress wordpress

Sat, 12 Sep 2026 07:45:00 +0000

Type Values Removed Values Added
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 execute code on the server. This is exploitable without authentication or approval because the plugin's V2 single-event template runs do_blocks() over buffered comment HTML, and WordPress returns a moderation-hash URL that allows an unauthenticated commenter to immediately view their own pending comment, delivering the injected block markup to the vulnerable code path before any moderation occurs. This does require comments to be enabled and visible on events.
Title The Events Calendar <= 6.17.4 - Unauthenticated PHP Object Injection to Remote Code Execution
Weaknesses CWE-502
References
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}


Subscriptions

Stellarwp The Events Calendar
Wordpress Wordpress
cve-icon MITRE

Status: PUBLISHED

Assigner: Wordfence

Published:

Updated: 2026-09-14T19:23:01.925Z

Reserved: 2026-08-21T21:25:40.295Z

Link: CVE-2026-78006

cve-icon Vulnrichment

Updated: 2026-09-14T19:15:37.467Z

cve-icon NVD

Status : Deferred

Published: 2026-09-12T08:16:24.240

Modified: 2026-09-14T20:16:52.847

Link: CVE-2026-78006

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-14T16:45:05Z

Weaknesses
  • CWE-502

    Deserialization of Untrusted Data