What’s Vulnerable › Vulnerabilities

CVE-2020-8420

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-01-28 · updated 2026-06-17
• Weakness: CWE-352

Description

An issue was discovered in Joomla! before 3.9.15. A missing CSRF token check in the LESS compiler of com_templates causes a CSRF vulnerability.

Affected products

• Joomla!: from 3.0.0 before 3.9.15 — fixed in 3.9.15

How to fix

Upgrade to a fixed version: Joomla! 3.9.15. Check the vendor advisory for mitigations.

References

• https://developer.joomla.org/security-centre/799-20200102-core-csrf-com-templates-less-compiler
• https://developer.joomla.org/security-centre/799-20200102-core-csrf-com-templates-less-compiler

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