CVE-2021-36828: Authenticated (admin+) Stored Cross-Site Scripting (XSS) in WP Maintenance plugin <= 6.0.7 versions.

Q: How do I fix CVE-2021-36828?

wp maintenance: upgrade to newer than 6.0.4. Exact commands for each OS are on this page.

Q: Is CVE-2021-36828 being exploited?

CVE-2021-36828 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-2021-36828 affect?

CVE-2021-36828 affects wp maintenance. Severity is medium (CVSS 4.8). Authenticated (admin+) Stored Cross-Site Scripting (XSS) in WP Maintenance plugin <= 6.0.7 versions.

Q: How urgent is CVE-2021-36828?

Priority 28/100. No elevated risk signals yet.

Routine

MEDIUM 4.8UPGRADE

CVE-2021-36828 is a medium-severity flaw (CVSS 4.8) affecting wp maintenance. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Authenticated (admin+) Stored Cross-Site Scripting (XSS) in WP Maintenance plugin <= 6.0.7 versions.

Why this priority

No elevated risk signals yet

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	0.5% (top 55%)
CISA exploited list	No
Weakness	CWE-79
Published	2022-04-15
Last modified	2026-06-17

Publisher (CNA): Patchstack · Vendor: wp maintenance project

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

Am I affected?

Timeline

2022-04-15 17:15 UTCPublished CVE record published
2026-06-17 03:59 UTCUpdated Record last modified

wp maintenance project wp maintenance UPGRADE

Affected: <= 6.0.4

Fixed in: newer than 6.0.4

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy wp-maintenance || rpm -q wp-maintenance || wp-maintenance --version

2. UPGRADE to newer than 6.0.4 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade wp-maintenance

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade wp-maintenance

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-2021-36828?

wp maintenance: upgrade to newer than 6.0.4. Exact commands for each OS are on this page.

Is CVE-2021-36828 being exploited?

CVE-2021-36828 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-2021-36828 affect?

CVE-2021-36828 affects wp maintenance. Severity is medium (CVSS 4.8). Authenticated (admin+) Stored Cross-Site Scripting (XSS) in WP Maintenance plugin <= 6.0.7 versions.

How urgent is CVE-2021-36828?

Priority 28/100. No elevated risk signals yet.

Related CVEs

CVE-2024-1472 MEDIUM 5.3 UPGRADE The WP Maintenance plugin for WordPress is vulnerable to Information Exposure in all versions up to, and inclu
CVE-2022-30536 LOW 3.4 UPGRADE Authenticated Stored Cross-Site Scripting (XSS) vulnerability in Florent Maillefaud's WP Maintenance plugin <=

References

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