CVE-2021-36830 MEDIUM

CVE-2021-36830: WordPress Comment Guestbook plugin <= 0.8.0 - Authenticated Stored Cross-Site Scripting (XSS) vulnerability

Vendor Mibuthu
Product Comment Guestbook (WordPress plugin)
Weakness CWE-79 · XSS
Published September 30, 2022
Last update April 28, 2026
View on NVD All CVEs

CVSS base score

4.8/10
Attack vector Network
Attack complexity Low
Privileges required High
User interaction Required
Confidentiality Low
Integrity Low

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

What the vulnerability does

01Description

Authenticated (admin+) Stored Cross-Site Scripting (XSS) vulnerability in Comment Guestbook plugin <= 0.8.0 at WordPress.

Explanation of Vulnerability in Simple Terms

02Summary

The Comment Guestbook WordPress plugin version 0.8.0 and earlier contains a cross-site scripting (XSS) vulnerability. An authenticated user with high privileges can inject malicious scripts that execute in other users' browsers when they view affected pages. The vulnerability requires user interaction and affects the integrity and confidentiality of site data.

What an attacker can do

03Attacker Capabilities

Inject malicious scripts that run in other users' browsers to steal data or perform actions on their behalf.

Potential impact on your site

04Site Impact

Admins and editors with high privileges could be tricked into viewing malicious content, compromising site security and user data.

Conditions required to exploit

05Prerequisites

Attacker must have high-level WordPress privileges (e.g., admin or editor role) and the victim must view a page containing the injected content.

Key dates

06Disclosure timeline

September 30, 2022 CVE published
April 28, 2026 Record updated

Related vulnerabilities

08Related CVE

CVE-2026-65519 WordPress Photo Gallery plugin <= 2.7.7.29 - Cross Site Scripting (XSS) vulnerability CVE-2026-65528 WordPress BSK PDF Manager plugin <= 3.8 - Cross Site Scripting (XSS) vulnerability CVE-2026-15016 Paid Memberships Pro – Content Restriction, User Registration, & Paid Subscriptions <= 3.8.1 - Authenticated (Subscriber+) Stored Cross-Site Scripting CVE-2026-15393 Cozy Blocks <= 2.2.11 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'postMeta.font.size' Block Attribute CVE-2026-7623 SureForms <= 2.8.1 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'headingWrapper' Block Attribute