CVE-2021-36851

Name: CVE-2021-36851
Creator: NVD / NIST
Published: 2022-04-04T20:15:09.487+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.4/10EPSS 0.54%

Last modified Jun 17, 2026

CVE-2021-36851 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. 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.. EPSS estimates a 0.54% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

5.4/10

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

EPSS Probability

0.54%

41.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Web-Settler	Testimonial Slider	<= 3.5.8.3

References

https://patchstack.com/database/vulnerability/testimonial-add/wordpress-testimonial-slider-plugin-3-5-8-3-cross-site-scripting-xss-vulnerabilityThird Party Advisory
https://wordpress.org/plugins/testimonial-add/#developersRelease Notes, Third Party Advisory
https://patchstack.com/database/vulnerability/testimonial-add/wordpress-testimonial-slider-plugin-3-5-8-3-cross-site-scripting-xss-vulnerabilityThird Party Advisory
https://wordpress.org/plugins/testimonial-add/#developersRelease Notes, Third Party Advisory

Timeline

Published: Apr 4, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-36851?

How severe is CVE-2021-36851?

CVE-2021-36851 has a CVSS score of 5.4/10 (MEDIUM severity). The EPSS model estimates a 0.54% probability of exploitation in the next 30 days.

How do I fix CVE-2021-36851?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-36851?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST