CVE-2021-34654: Custom Post Type Relations <= 1.0 Reflected Cross-Site Scripting

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.9% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2021-08-16 · updated 2026-06-17
Weakness: CWE-79

Description

The Custom Post Type Relations WordPress plugin is vulnerable to Reflected Cross-Site Scripting via the cptr[name] parameter found in the ~/pages/admin-page.php file which allows attackers to inject arbitrary web scripts, in versions up to and including 1.0.

Affected products

Custom Post Type Relations: through 1.0

References

https://plugins.trac.wordpress.org/browser/custom-post-type-relations/trunk/pages/admin-page.php#L60
https://www.wordfence.com/vulnerability-advisories/#CVE-2021-34654
https://plugins.trac.wordpress.org/browser/custom-post-type-relations/trunk/pages/admin-page.php#L60
https://www.wordfence.com/vulnerability-advisories/#CVE-2021-34654

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