CVE-2021-24518: The WPFront Notification Bar WordPress plugin before 2.0.0.07176 does not sanitise or escape its Custom CSS se

Q: How do I fix CVE-2021-24518?

notification bar: upgrade to 2.0.0.07176. Exact commands for each OS are on this page.

Q: Is CVE-2021-24518 being exploited?

CVE-2021-24518 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-2021-24518 affect?

CVE-2021-24518 affects notification bar. Severity is medium (CVSS 4.8). The WPFront Notification Bar WordPress plugin before 2.0.0.07176 does not sanitise or escape its Custom CSS setting, allowing high privilege users such as admin to set XSS payload in it even when the unfiltered_html capability is disallowed

Q: How urgent is CVE-2021-24518?

Priority 35/100. Public exploit reference

Routine

MEDIUM 4.8UPGRADE

CVE-2021-24518 is a medium-severity flaw (CVSS 4.8) affecting notification bar. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The WPFront Notification Bar WordPress plugin before 2.0.0.07176 does not sanitise or escape its Custom CSS setting, allowing high privilege users such as admin to set XSS payload in it even when the unfiltered_html capability is disallowed, leading to an authenticated Stored Cross-Site Scripting issue

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	0.7% (top 47%)
CISA exploited list	No
Weakness	CWE-79
Published	2021-08-16
Last modified	2026-06-17

Publisher (CNA): WPScan · Vendor: wpfront

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

Am I affected?

Timeline

2021-08-16 11:15 UTCPublished CVE record published
2026-06-17 03:40 UTCUpdated Record last modified

wpfront notification bar UPGRADE

Affected: < 2.0.0.07176

Fixed in: 2.0.0.07176

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy notification-bar || rpm -q notification-bar || notification-bar --version

2. UPGRADE to 2.0.0.07176 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade notification-bar

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade notification-bar

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-2021-24518?

notification bar: upgrade to 2.0.0.07176. Exact commands for each OS are on this page.

Is CVE-2021-24518 being exploited?

CVE-2021-24518 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-2021-24518 affect?

CVE-2021-24518 affects notification bar. Severity is medium (CVSS 4.8). The WPFront Notification Bar WordPress plugin before 2.0.0.07176 does not sanitise or escape its Custom CSS setting, allowing high privilege users such as admin to set XSS payload in it even when the unfiltered_html capability is disallowed

How urgent is CVE-2021-24518?

Priority 35/100. Public exploit reference

Software pages

WordPress vulnerabilities

Related CVEs

CVE-2022-29476 MEDIUM 6.1 UPGRADE Unauthenticated Stored Cross-Site Scripting (XSS) vulnerability in 8 Degree Themes otification Bar for WordPre

References

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