CVE-2021-39340

MEDIUM 4.8CVE-2021-39340 · Published 01/11/2021 · updated 17/06/2026

In short

CVE-2021-39340 is a MEDIUM (CVSS 4.8) vulnerability affecting notification (bracketspace).
Chance of exploitation in the next 30 days (EPSS): 0.93%, higher than 60.7% of all vulnerabilities.
No patched version is listed yet: follow the vendor's advisory in References.

Package	Affected versions	Patched versions
notification bracketspace	`≤ 7.2.4`	No fix yet

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.

References

BigTiger2020/word-press · Exploit
plugins.trac.wordpress.org/browser/notification/tags/7.2.4/src/classes/Utils/Settings.php · Patch
wordfence.com/vulnerability-advisories · Third Party Advisory

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