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CVE-2026-103481— Gwolle Guestbook <= 5.1.1 - Reflected Cross-Site Scripting via 'permalink' Parameter

Quick assessment

Affected
mpol Gwolle Guestbook
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 Gwolle Guestbook 插件在所有 5.1.1 及更早版本中，因输入过滤不足和输出转义缺失，其"permalink"参数存在反射型跨站脚本（XSS）漏洞。该漏洞允许未认证的攻击者在成功诱使用户执行操作（例如点击某个链接）时，向页面注入任意 Web 脚本并使其执行。

CVSS 6.1 · Medium EPSS 0.21% · P11

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
mpol Gwolle Guestbook ≤ 5.1.1 affected
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I. Basic Information for CVE-2026-103481

Vulnerability Information
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Vulnerability Title
Gwolle Guestbook <= 5.1.1 - Reflected Cross-Site Scripting via 'permalink' Parameter
Source: CVE Program / CVE List V5
Vulnerability Description
The Gwolle Guestbook plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the 'permalink' parameter in all versions up to, and including, 5.1.1 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
mpol Gwolle Guestbook 0 ~ 5.1.1 -

II. Public POCs for CVE-2026-103481

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III. Intelligence Information for CVE-2026-103481

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Vendor Pages for CVE-2026-103481 (3)

Other References for CVE-2026-103481 (1)

Other References for CVE-2026-103481 (1)

IV. Related Vulnerabilities

Same product: Gwolle Guestbook
Same vendor: mpol
Same weakness: CWE-79

V. Comments for CVE-2026-103481

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