CVE-2021-24756: The WP System Log WordPress plugin before 1.0.21 does not sanitise, validate and escape the IP address retriev

Q: How do I fix CVE-2021-24756?

wp system log: upgrade to 1.0.21. Exact commands for each OS are on this page.

Q: Is CVE-2021-24756 being exploited?

CVE-2021-24756 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-2021-24756 affect?

CVE-2021-24756 affects wp system log. Severity is medium (CVSS 6.1). The WP System Log WordPress plugin before 1.0.21 does not sanitise, validate and escape the IP address retrieved from login requests before outputting them in the admin dashboard, which could allow unauthenticated attacker to perform Cross-

Q: How urgent is CVE-2021-24756?

Priority 44/100. Public exploit reference

This month

MEDIUM 6.1UPGRADE

CVE-2021-24756 is a medium-severity flaw (CVSS 6.1) affecting wp system log. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The WP System Log WordPress plugin before 1.0.21 does not sanitise, validate and escape the IP address retrieved from login requests before outputting them in the admin dashboard, which could allow unauthenticated attacker to perform Cross-Site Scripting attacks against admins viewing the logs.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.3% (top 29%)
CISA exploited list	No
Weakness	CWE-79
Published	2021-12-13
Last modified	2026-06-17

Publisher (CNA): WPScan · Vendor: wp system log project

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

Am I affected?

Timeline

2021-12-13 11:15 UTCPublished CVE record published
2026-06-17 03:40 UTCUpdated Record last modified

wp system log project wp system log UPGRADE

Affected: < 1.0.21

Fixed in: 1.0.21

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy wp-system-log || rpm -q wp-system-log || wp-system-log --version

2. UPGRADE to 1.0.21 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade wp-system-log

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade wp-system-log

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-2021-24756?

wp system log: upgrade to 1.0.21. Exact commands for each OS are on this page.

Is CVE-2021-24756 being exploited?

CVE-2021-24756 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-2021-24756 affect?

CVE-2021-24756 affects wp system log. Severity is medium (CVSS 6.1). The WP System Log WordPress plugin before 1.0.21 does not sanitise, validate and escape the IP address retrieved from login requests before outputting them in the admin dashboard, which could allow unauthenticated attacker to perform Cross-

How urgent is CVE-2021-24756?

Priority 44/100. Public exploit reference

Software pages

WordPress vulnerabilities

References

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