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CVE-2026-78265— WordPress The Events Calendar plugin <= 6.17.2 - PHP Object Injection vulnerability

Quick assessment

Affected
Nexcess 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 6.17.2及之前版本存在反序列化注入漏洞，该漏洞源于未经验证的PHP对象注入。

CVSS 9.8 · Critical EPSS 0.56% · P47

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
Nexcess The Events Calendar n/a≤ 6.17.2 affected
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I. Basic Information for CVE-2026-78265

Vulnerability Information
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Vulnerability Title
WordPress The Events Calendar plugin <= 6.17.2 - PHP Object Injection vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Unauthenticated PHP Object Injection in The Events Calendar <= 6.17.2 versions.
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
Nexcess The Events Calendar 反序列化注入漏洞
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 6.17.2及之前版本存在反序列化注入漏洞，该漏洞源于未经验证的PHP对象注入。
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
Nexcess The Events Calendar n/a ~ 6.17.2 -

II. Public POCs for CVE-2026-78265

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III. Intelligence Information for CVE-2026-78265

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Other References for CVE-2026-78265 (1)

IV. Related Vulnerabilities

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