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CVE-2026-78159— The Events Calendar <= 6.17.3 - Unauthenticated Code Injection to Remote Code Execution via Widget 'classes' Map Callable Invocation

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.

Nexcess The Events Calendar是Nexcess公司的一个事件日历管理插件。 Nexcess The Events Calendar 6.17.3及之前版本存在代码注入漏洞，该漏洞源于对widget的classes映射验证不足，允许普通数组有效载荷绕过is_safe_widget_instance()对象检查并到达Element_Classes::parse_array()中的可调用调用接收点，可能导致未经身份验证的攻击者在服务器上执行代码。

CVSS 9.8 · Critical EPSS 1.39% · P72

Affected Version Matrix 1

VendorProduct Version RangeStatus
stellarwp The Events Calendar ≤ 6.17.3 affected
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I. Basic Information for CVE-2026-78159

Vulnerability Information
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Vulnerability Title
The Events Calendar <= 6.17.3 - Unauthenticated Code Injection to Remote Code Execution via Widget 'classes' Map Callable Invocation
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, 6.17.3 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.
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
对生成代码的控制不恰当(代码注入)
Source: CVE Program / CVE List V5
Vulnerability Title
Nexcess The Events Calendar 代码注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Nexcess The Events Calendar是Nexcess公司的一个事件日历管理插件。 Nexcess The Events Calendar 6.17.3及之前版本存在代码注入漏洞，该漏洞源于对widget的classes映射验证不足，允许普通数组有效载荷绕过is_safe_widget_instance()对象检查并到达Element_Classes::parse_array()中的可调用调用接收点，可能导致未经身份验证的攻击者在服务器上执行代码。
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 ~ 6.17.3 -

II. Public POCs for CVE-2026-78159

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III. Intelligence Information for CVE-2026-78159

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Patches & Fixes for CVE-2026-78159 (2)

Vendor Pages for CVE-2026-78159 (2)

Other References for CVE-2026-78159 (2)

IV. Related Vulnerabilities

Same product: The Events Calendar
Same vendor: stellarwp
Same weakness: CWE-94

V. Comments for CVE-2026-78159

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