What’s Vulnerable › Vulnerabilities

CVE-2021-38339: Simple Matted Thumbnails <= 1.01 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 Simple Matted Thumbnails WordPress plugin is vulnerable to Reflected Cross-Site Scripting due to a reflected $_SERVER["PHP_SELF"] value in the ~/simple-matted-thumbnail.php file which allows attackers to inject arbitrary web scripts, in versions up to and including 1.01.

Affected products

• Simple Matted Thumbnails: through 1.01

References

• https://plugins.trac.wordpress.org/browser/simple-matted-thumbnails/tags/1.01/simple-matted-thumbnail.php#L122
• https://www.wordfence.com/vulnerability-advisories/#CVE-2021-38339
• https://plugins.trac.wordpress.org/browser/simple-matted-thumbnails/tags/1.01/simple-matted-thumbnail.php#L122
• https://www.wordfence.com/vulnerability-advisories/#CVE-2021-38339

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