What’s Vulnerable › Vulnerabilities

CVE-2020-10242

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-03-16 · updated 2026-06-17
• Weakness: CWE-79

Description

An issue was discovered in Joomla! before 3.9.16. Inadequate handling of CSS selectors in the Protostar and Beez3 JavaScript allows XSS attacks.

Affected products

• Joomla!: from 3.0.0 before 3.9.16 — fixed in 3.9.16

How to fix

Upgrade to a fixed version: Joomla! 3.9.16. Check the vendor advisory for mitigations.

References

• https://developer.joomla.org/security-centre/803-20200302-core-xss-in-protostar-and-beez3
• https://developer.joomla.org/security-centre/803-20200302-core-xss-in-protostar-and-beez3

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