CVE-2022-1896: The underConstruction WordPress plugin before 1.21 does not sanitise or escape the "Display a custom page usin

Q: How do I fix CVE-2022-1896?

underconstruction: upgrade to 1.21. Exact commands for each OS are on this page.

Q: Is CVE-2022-1896 being exploited?

CVE-2022-1896 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2022-1896 affect?

CVE-2022-1896 affects underconstruction. Severity is medium (CVSS 4.8). 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

Q: How urgent is CVE-2022-1896?

Priority 34/100. Public exploit reference

Routine

MEDIUM 4.8UPGRADE

CVE-2022-1896 is a medium-severity flaw (CVSS 4.8) affecting underconstruction. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	4.8 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	Required
EPSS exploit chance	0.6% (top 52%)
CISA exploited list	No
Weakness	CWE-79
Published	2022-06-20
Last modified	2026-06-17

Publisher (CNA): WPScan · Vendor: underconstruction project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2022-06-20 11:15 UTCPublished CVE record published
2026-06-17 04:23 UTCUpdated Record last modified

underconstruction project underconstruction UPGRADE

Affected: < 1.21

Fixed in: 1.21

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy underconstruction || rpm -q underconstruction || underconstruction --version

2. UPGRADE to 1.21 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade underconstruction

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade underconstruction

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2022-1896?

underconstruction: upgrade to 1.21. Exact commands for each OS are on this page.

Is CVE-2022-1896 being exploited?

CVE-2022-1896 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2022-1896 affect?

CVE-2022-1896 affects underconstruction. Severity is medium (CVSS 4.8). 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

How urgent is CVE-2022-1896?

Priority 34/100. Public exploit reference

Software pages

WordPress vulnerabilities

Related CVEs

CVE-2022-1895 MEDIUM 4.3 UPGRADE The underConstruction WordPress plugin before 1.20 does not have CSRF check in place when deactivating the con
CVE-2021-39320 MEDIUM 6.1 UPGRADE The underConstruction plugin <= 1.18 for WordPress echoes out the raw value of `$GLOBALS['PHP_SELF']` in the u

References

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