CVE-2021-24331: Smooth Scroll Page Up/Down Buttons < 1.4 - Authenticated Stored XSS

Severity: medium (CVSS 4.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2021-06-01 · updated 2026-06-17
Weakness: CWE-79

Description

The Smooth Scroll Page Up/Down Buttons WordPress plugin before 1.4 did not properly sanitise and validate its settings, such as psb_distance, psb_buttonsize, psb_speed, only validating them client side. This could allow high privilege users (such as admin) to set XSS payloads in them

Affected products

Smooth Scroll Page Up/Down Buttons: before 1.4 — fixed in 1.4

How to fix

Upgrade to a fixed version: Smooth Scroll Page Up/Down Buttons 1.4. Check the vendor advisory for mitigations.

References

https://m0ze.ru/vulnerability/%5B2021-04-24%5D-%5BWordPress%5D-%5BCWE-79%5D-Smooth-Scroll-Page-UpDown-Buttons-WordPress-Plugin-v1.3.txt
https://wpscan.com/vulnerability/2c7ca586-def8-4723-b779-09d7f37fa1ab
https://m0ze.ru/vulnerability/%5B2021-04-24%5D-%5BWordPress%5D-%5BCWE-79%5D-Smooth-Scroll-Page-UpDown-Buttons-WordPress-Plugin-v1.3.txt
https://wpscan.com/vulnerability/2c7ca586-def8-4723-b779-09d7f37fa1ab

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