CVE-2021-36851: Authenticated (editor or higher user role) Cross-Site Scripting (XSS) vulnerability in Web-Settler Testimonial

Q: How do I fix CVE-2021-36851?

testimonial slider: upgrade to newer than 3.5.8.3. Exact commands for each OS are on this page.

Q: Is CVE-2021-36851 being exploited?

CVE-2021-36851 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-36851 affect?

CVE-2021-36851 affects testimonial slider. Severity is medium (CVSS 4.1). 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, mps

Q: How urgent is CVE-2021-36851?

Priority 26/100. No elevated risk signals yet.

Routine

MEDIUM 4.1UPGRADE

CVE-2021-36851 is a medium-severity flaw (CVSS 4.1) affecting testimonial slider. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	0.6% (top 53%)
CISA exploited list	No
Weakness	CWE-79
Published	2022-04-04
Last modified	2026-06-17

Publisher (CNA): Patchstack · Vendor: web-settler

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2022-04-04 20:15 UTCPublished CVE record published
2026-06-17 03:59 UTCUpdated Record last modified

web-settler testimonial slider UPGRADE

Affected: <= 3.5.8.3

Fixed in: newer than 3.5.8.3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy testimonial-slider || rpm -q testimonial-slider || testimonial-slider --version

2. UPGRADE to newer than 3.5.8.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade testimonial-slider

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade testimonial-slider

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-36851?

testimonial slider: upgrade to newer than 3.5.8.3. Exact commands for each OS are on this page.

Is CVE-2021-36851 being exploited?

CVE-2021-36851 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-36851 affect?

CVE-2021-36851 affects testimonial slider. Severity is medium (CVSS 4.1). 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, mps

How urgent is CVE-2021-36851?

Priority 26/100. No elevated risk signals yet.

Software pages

WordPress vulnerabilities

Related CVEs

CVE-2022-44741 MEDIUM 6.1 UPGRADE Cross-Site Request Forgery (CSRF) vulnerability leading to Cross-Site Scripting (XSS) in David Anderson Testim

References

← Back to latest CVEs