CVE-2021-39313: Simple Image Gallery <= 1.0.6 Reflected Cross-Site Scripting

Severity: medium (CVSS 4.3 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-12-14 · updated 2026-06-17
Weakness: CWE-79

Description

The Simple Image Gallery WordPress plugin is vulnerable to Reflected Cross-Site Scripting via the msg parameter found in the ~/simple-image-gallery.php file which allows attackers to inject arbitrary web scripts, in versions up to and including 1.0.6.

Affected products

Simple Image Gallery: through 1.0.6

References

https://plugins.trac.wordpress.org/browser/simple-responsive-image-gallery/tags/1.0.6/simple-image-gallery.php#L420
https://www.wordfence.com/vulnerability-advisories/#CVE-2021-39313
https://plugins.trac.wordpress.org/browser/simple-responsive-image-gallery/tags/1.0.6/simple-image-gallery.php#L420
https://www.wordfence.com/vulnerability-advisories/#CVE-2021-39313

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