CVE-2021-24685: Flat Preloader < 1.5.4 - CSRF to Stored Cross-Site Scripting

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2021-11-01 · updated 2026-06-17
Weakness: CWE-79

Description

The Flat Preloader WordPress plugin before 1.5.4 does not enforce nonce checks when saving its settings, as well as does not sanitise and escape them, which could allow attackers to a make logged in admin change them with a Cross-Site Scripting payload (triggered either in the frontend or backend depending on the payload)

Affected products

Flat Preloader: before 1.5.4 — fixed in 1.5.4

How to fix

Upgrade to a fixed version: Flat Preloader 1.5.4. Check the vendor advisory for mitigations.

References

https://wpscan.com/vulnerability/972ecde8-3d44-4dd9-81e3-643d8737434f
https://wpscan.com/vulnerability/972ecde8-3d44-4dd9-81e3-643d8737434f

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