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CVE-2026-87115— VikAppointments Services Booking Calendar <= 1.2.21 - Unauthenticated Arbitrary File Deletion via 'old_vapcfN' Parameter

Quick assessment

Affected
e4jvikwp VikAppointments Services Booking 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 VikAppointments Services Booking Calendar 插件在所有 1.2.21 及更早版本中，由于 extract 函数中文件路径验证不足，存在任意文件删除漏洞。这使得未认证的攻击者能够删除服务器上的任意文件，若删除了关键文件（如 wp-config.php），则极易导致远程代码执行。要利用此漏洞，需在确认页的短代码中至少发布一个“文件类型”的自定义字段，因为该字段在插件默认安装时不会被创建。

CVSS 9.1 · Critical EPSS 0.88% · P58

Affected Version Matrix 1

VendorProduct Version RangeStatus
e4jvikwp VikAppointments Services Booking Calendar ≤ 1.2.21 affected
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I. Basic Information for CVE-2026-87115

Vulnerability Information
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Vulnerability Title
VikAppointments Services Booking Calendar <= 1.2.21 - Unauthenticated Arbitrary File Deletion via 'old_vapcfN' Parameter
Source: CVE Program / CVE List V5
Vulnerability Description
The VikAppointments Services Booking Calendar plugin for WordPress is vulnerable to arbitrary file deletion due to insufficient file path validation in the extract function in all versions up to, and including, 1.2.21. This makes it possible for unauthenticated attackers to delete arbitrary files on the server, which can easily lead to remote code execution when the right file is deleted (such as wp-config.php). Exploitation requires at least one File-type custom field to be published on the confirmation page shortcode, as this field is not created by default during plugin installation.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
e4jvikwp VikAppointments Services Booking Calendar 0 ~ 1.2.21 -

II. Public POCs for CVE-2026-87115

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III. Intelligence Information for CVE-2026-87115

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Patches & Fixes for CVE-2026-87115 (3)

Vendor Advisories for CVE-2026-87115 (1)

Vendor Pages for CVE-2026-87115 (1)

Other References for CVE-2026-87115 (3)

IV. Related Vulnerabilities

Same product: VikAppointments Services Booking Calendar
Same vendor: e4jvikwp
Same weakness: CWE-22

V. Comments for CVE-2026-87115

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