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CVE-2026-78006— The Events Calendar <= 6.17.4 - Unauthenticated PHP Object Injection to Remote Code Execution

Quick assessment

Affected
stellarwp The Events Calendar
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WordPress 的“The Events Calendar”插件在 6.17.4 及之前所有版本中均存在远程代码执行（Remote Code Execution）漏洞，该漏洞位于 函数中。 其根本原因在于 函数的保护机制不足，由于 PHP 在预解析阶段会触发魔术方法，攻击者可以利用这一点绕过该检查。具体而言，通过 在到达 之前伪造一个有效的 完整性属性，从而使得反序列化过程得以进行。 这使得未认证的 attackers（攻击者）能够在服务器上执行代码。 该漏洞无需认证或审批即可利用，因为插件的 V2 单事件模板

CVSS 9.8 · Critical
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I. Basic Information for CVE-2026-78006

Vulnerability Information
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Vulnerability Title
The Events Calendar <= 6.17.4 - Unauthenticated PHP Object Injection to Remote Code Execution
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
可信数据的反序列化
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
stellarwp The Events Calendar 0 ~ 6.17.4 -

II. Public POCs for CVE-2026-78006

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III. Intelligence Information for CVE-2026-78006

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Patches & Fixes for CVE-2026-78006 (2)

Vendor Pages for CVE-2026-78006 (3)

Other References for CVE-2026-78006 (2)

IV. Related Vulnerabilities

Same product: The Events Calendar
Same vendor: stellarwp
Same weakness: CWE-502

V. Comments for CVE-2026-78006

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