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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 The Events Calendar是WordPress基金会的一款为网站提供活动日历创建、日程管理与展示功能的CMS插件。 WordPress The Events Calendar 6.17.4及之前版本存在反序列化注入漏洞，该漏洞源于is_safe_widget_instance函数保护不足，可被绕过，且enable_rendering_widget_copied()在unserialize()之前伪造有效的wp_hash完整性属性，可能导致未经身份验证的攻击者在服务器上执行任

CVSS 9.8 · Critical EPSS 1.47% · P74

Affected Version Matrix 1

VendorProduct Version RangeStatus
stellarwp The Events Calendar ≤ 6.17.4 affected
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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
Vulnerability Title
WordPress The Events Calendar 反序列化注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress The Events Calendar是WordPress基金会的一款为网站提供活动日历创建、日程管理与展示功能的CMS插件。 WordPress The Events Calendar 6.17.4及之前版本存在反序列化注入漏洞，该漏洞源于is_safe_widget_instance函数保护不足，可被绕过，且enable_rendering_widget_copied()在unserialize()之前伪造有效的wp_hash完整性属性，可能导致未经身份验证的攻击者在服务器上执行任
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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