CVE-2021-24533: Maintenance < 4.03 - Authenticated Stored XSS

Severity: medium (CVSS 4.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2021-08-23 · updated 2026-06-17
Weakness: CWE-79

Description

The Maintenance WordPress plugin before 4.03 does not sanitise or escape some of its settings, allowing high privilege users such as admin to se Cross-Site Scripting payload in them (even when the unfiltered_html capability is disallowed), which will be triggered in the frontend

Affected products

Maintenance: before 4.03 — fixed in 4.03

How to fix

Upgrade to a fixed version: Maintenance 4.03. Check the vendor advisory for mitigations.

References

https://wpscan.com/vulnerability/174b2119-b806-4da4-a23d-c19b552c86cb
https://wpscan.com/vulnerability/174b2119-b806-4da4-a23d-c19b552c86cb

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