CVE-2020-10240

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.3% 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-20

Description

An issue was discovered in Joomla! before 3.9.16. Missing length checks in the user table can lead to the creation of users with duplicate usernames and/or email addresses.

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/805-20200304-core-identifier-collisions-in-com-users
https://developer.joomla.org/security-centre/805-20200304-core-identifier-collisions-in-com-users

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