CVE-2022-1896: underConstruction < 1.21 - Admin+ Stored Cross-Site Scripting

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: 2022-06-20 · updated 2026-06-17
Weakness: CWE-79

Description

The underConstruction WordPress plugin before 1.21 does not sanitise or escape the "Display a custom page using your own HTML" setting before outputting it, allowing high privilege users to perform Cross-Site Scripting attacks even when the unfiletred_html capability is disallowed.

Affected products

underConstruction: before 1.21 — fixed in 1.21

How to fix

Upgrade to a fixed version: underConstruction 1.21. Check the vendor advisory for mitigations.

References

https://wpscan.com/vulnerability/3e8bd875-2435-4a15-8ee8-8a00882b499c
https://wpscan.com/vulnerability/3e8bd875-2435-4a15-8ee8-8a00882b499c

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