What’s Vulnerable › Vulnerabilities

CVE-2021-23127: [20210301] - Core - Insecure randomness within 2FA secret generation

• Severity: critical (CVSS 9.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-03-04 · updated 2026-06-17

Description

An issue was discovered in Joomla! 3.2.0 through 3.9.24. Usage of an insufficient length for the 2FA secret accoring to RFC 4226 of 10 bytes vs 20 bytes.

Affected products

• Joomla!: from 3.2.0 before 3.9.25 — fixed in 3.9.25

How to fix

Upgrade to a fixed version: Joomla! 3.9.25. Check the vendor advisory for mitigations.

References

• https://developer.joomla.org/security-centre/841-20210301-core-insecure-randomness-within-2fa-secret-generation.html
• https://developer.joomla.org/security-centre/841-20210301-core-insecure-randomness-within-2fa-secret-generation.html

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