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Critical · 9.8 Public exploit CVE-2026-78159 EUVD-2026-76833GHSA-9c57-9fxg-8x9j

The Events Calendar <= 6.17.3 - Unauthenticated Code Injection to Remote Code Execution via Widget 'classes' Map Callable Invocation

Published Sep 12, 2026 · Updated Sep 14, 2026 · Assigned by Wordfence

Vendor: stellarwp Product: The Events Calendar Category: Web / CMS

Description

The The Events Calendar plugin for WordPress is vulnerable to Remote Code Execution in all versions up to, and including, 6.17.3 via the parse_array function. This is due to insufficient validation of the widget 'classes' map, allowing a plain-array payload to bypass the is_safe_widget_instance() object check and reach the callable-invocation sink in Element_Classes::parse_array(). This makes it possible for unauthenticated attackers to execute code on the server. Exploitation requires that the targeted site has comments enabled on tribe_events posts and that at least one comment containing a crafted wp:legacy-widget block has been submitted, as the attack chain is triggered when do_blocks() processes the single-event HTML including the comment area.

Affected products

VendorProductAffectedFixed
stellarwp The Events Calendar ≤ 6.17.3 —

Public exploits

Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.

Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.

GitHub 1 repository

  • abraxas/CVE-2026-78159 ★ 1 · Sep 19, 2026

    CVE-2026-78159 - stellarwp - Critical 9.8 - Unauthenticated POST /wp-comments-post.php - Remote Code Execution

Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.

References