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CVE-2021-39340

MEDIUM 4.8 CVSS 3.1
Published
November 1, 2021
Last modified
June 17, 2026
NVD status
Modified
Reported by
security@wordfence.com
Weakness
CWE-79
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

Description

The Notification WordPress plugin is vulnerable to Stored Cross-Site Scripting due to insufficient input validation and sanitization via several parameters found in the ~/src/classes/Utils/Settings.php file which made it possible for attackers with administrative user access to inject arbitrary web scripts, in versions up to and including 7.2.4. This affects multi-site installations where unfiltered_html is disabled for administrators, and sites where unfiltered_html is disabled.

Affected WordPress components

  • Notification – Custom Notifications and Alerts for WordPress Plugin · notification
    Confirmed match Active
    From 7.2.4 (including) to 7.2.4 (including); Up to and including 7.2.4
    View on WordPress.org

A confirmed match is backed by the plugin or theme slug. A possible match is based on the product name only and should be verified.

Affected products and versions

  • Notification – Custom Notifications and Alerts for WordPress Notification – Custom Notifications and Alerts for WordPress — From 7.2.4 (including) to 7.2.4 (including)
  • bracketspace notification — Up to and including 7.2.4

References

  • github.com https://github.com/BigTiger2020/word-press/blob/main/Notification.md Exploit, Third Party Advisory
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/notification/tags/7.2.4/src/classes/Utils/Settings.php#L167 Patch, Third Party Advisory
  • wordfence.com https://wordfence.com/vulnerability-advisories/#CVE-2021-39340 Third Party Advisory
  • nvd.nist.gov Official NVD record