CVE-2021-36851 - CVE House

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Status published Medium CVE-2021-36851

WordPress Testimonial Slider plugin <= 3.5.8.3 - Cross-Site Scripting (XSS) vulnerability

4.1 CVSS

Vulnerability Description

Authenticated (editor or higher user role) Cross-Site Scripting (XSS) vulnerability in Web-Settler Testimonial Slider – Free Testimonials Slider Plugin (WordPress plugin) via parameters mpsp_posts_bg_color, mpsp_posts_description_color, mpsp_slide_nav_button_color.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

Vulnerability discovered by Ngo Van Thien (Patchstack Alliance).

References

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Affected Vendor

Web-Settler

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Affected Software

Testimonial Slider – Free Testimonials Slider Plugin (WordPress plugin)

Vulnerable Versions:

<= 3.5.8.3

Timeline

Official Publish: April 4th, 2022

Last Modified: April 28th, 2026

Added to House: July 21st, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:L/A:N

Weaknesses (CWE)

MITRE ATT&CK TTPs

T1189 Drive-by Compromise

T1059.007 JavaScript

T1539 Steal Web Session Cookie

T1213 Data from Information Repositories

T1567 Exfiltration Over Web Service

T1491.001 Defacement