CVE-2020-11891

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-04-21 · updated 2026-06-17

Description

An issue was discovered in Joomla! before 3.9.17. Incorrect ACL checks in the access level section of com_users allow the unauthorized editing of usergroups.

Affected products

Joomla!: from 3.8.8 before 3.9.17 — fixed in 3.9.17

How to fix

Upgrade to a fixed version: Joomla! 3.9.17. Check the vendor advisory for mitigations.

References

https://developer.joomla.org/security-centre/809-20200401-core-incorrect-access-control-in-com-users-access-level-editing-function.html
https://developer.joomla.org/security-centre/809-20200401-core-incorrect-access-control-in-com-users-access-level-editing-function.html

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