CVE-2021-38332: On Page SEO + Whatsapp Chat Button <= 1.0.1 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: 2021-09-10 · updated 2026-06-17
Weakness: CWE-79

Description

The On Page SEO + Whatsapp Chat Button Plugin WordPress plugin is vulnerable to Reflected Cross-Site Scripting due to a reflected $_SERVER["PHP_SELF"] value in the ~/settings.php file which allows attackers to inject arbitrary web scripts, in versions up to and including 1.0.1.

Affected products

Ops-Robots-Txt Project Ops-Robots-Txt: through 1.0.1

References

https://plugins.trac.wordpress.org/browser/ops-robots-txt/tags/1.0.0/settings.php#L175
https://www.wordfence.com/vulnerability-advisories/#CVE-2021-38332
https://plugins.trac.wordpress.org/browser/ops-robots-txt/tags/1.0.0/settings.php#L175
https://www.wordfence.com/vulnerability-advisories/#CVE-2021-38332

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