What’s Vulnerable › Vulnerabilities

CVE-2021-24378: Autoptimize < 2.7.8 - Authenticated Stored XSS via File Upload

• Severity: medium (CVSS 4.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-06-21 · updated 2026-06-17
• Weakness: CWE-79

Description

The Autoptimize WordPress plugin before 2.7.8 does not check for malicious files such as .html in the archive uploaded via the 'Import Settings' feature. As a result, it is possible for a high privilege user to upload a malicious file containing JavaScript code inside an archive which will execute when a victim visits index.html inside the plugin directory.

Affected products

• Autoptimize: before 2.7.8 — fixed in 2.7.8

How to fix

Upgrade to a fixed version: Autoptimize 2.7.8. Check the vendor advisory for mitigations.

References

• https://wpscan.com/vulnerability/375bd694-1a30-41af-bbd4-8a8ee54f0dbf
• https://wpscan.com/vulnerability/375bd694-1a30-41af-bbd4-8a8ee54f0dbf

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