Is Under Construction safe?

No known vulnerability affects the current version (5.83). 8 issues were found in earlier versions and fixed, the latest disclosed on Jul 10, 2026.

Checked 4 days ago against the WPVulnerability database, for version 5.83.

How it’s looked after

Last release: Sep 18, 2026 (1 month ago)
Releases in the last year: 5
Tested up to: WordPress 7.1.4
Support resolved: 4 of 4 threads in two months
Active installs: 600K+

8 known vulnerabilities

1 high
3 medium
4 not rated

None affects the current version.

Disclosed each year

20212
20234
20261

Every known vulnerability in Under Construction

Newest first, with any that affect the current version at the top.

medium
Authenticated (Subscriber+) Arbitrary File Read via template_thumbnail Parameter
Fixed in 5.81 · CVE-2026-11426 · Jul 10, 2026 · Wordfence
high
Unauthenticated Stored Cross-Site Scripting
Fixed in 5.83 · CVE-2026-81295 · Feb 10, 2023 · Wordfence
medium
Cross-Site Request Forgery via admin_action_ucp_dismiss_notice
Fixed in 3.97 · CVE-2023-0831 · Feb 10, 2023 · Wordfence
medium
Cross-Site Request Forgery via admin_action_install_weglot
Fixed in 3.97 · CVE-2023-0832 · Feb 10, 2023 · Wordfence
WordPress Under Construction Plugin <= 3.96 is vulnerable to Cross Site Request Forgery (CSRF)
Fixed in 3.97 · Feb 10, 2023 · Patchstack
Authenticated Stored Cross-Site Scripting
Fixed in 3.86 · Jan 20, 2021 · Wordfence
Authenticated Stored Cross-Site Scripting (XSS) vulnerability
Fixed in 3.86 · Jan 20, 2021 · Patchstack
Authenticated Stored Cross-Site Scripting (XSS)
Fixed in 3.86 · WPScan

Questions about Under Construction’s security

Is Under Construction safe to use?

No known vulnerability affects its current version. Earlier versions had issues that are now fixed, so keep Under Construction updated: most attacks target sites that haven’t updated.

Does Under Construction have known security vulnerabilities?

None that affect the current version. WPVulnerability’s database lists 8 older issues, fixed in earlier versions, so keep Under Construction up to date.

Is Under Construction still maintained?

Yes. Its last release was 1 month ago. Its authors resolved 4 of the 4 support threads opened in the last two months.

Is Under Construction compatible with the latest WordPress?

Yes. It’s tested up to WordPress 7.1.4, the current version.

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Vulnerability data from WPVulnerability (CC0), which gathers records from CVE, Wordfence, Patchstack and WPScan. A clean record isn’t a guarantee: keep every plugin updated.