CVE-2020-13761

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: 2020-06-02 · updated 2026-06-17
Weakness: CWE-79

Description

In Joomla! before 3.9.19, lack of input validation in the heading tag option of the "Articles - Newsflash" and "Articles - Categories" modules allows XSS.

Affected products

Joomla!: from 3.0.1 before 3.9.19; 3.0.0, 3.0.0-alpha1, 3.0.0-alpha2, 3.0.0-beta1 — fixed in 3.9.19

How to fix

Upgrade to a fixed version: Joomla! 3.9.19. Check the vendor advisory for mitigations.

References

https://developer.joomla.org/security-centre/813-20200601-core-xss-in-modules-heading-tag-option
https://developer.joomla.org/security-centre/813-20200601-core-xss-in-modules-heading-tag-option

Get alerted when CVE-2020-13761 or the next vulnerability affects your stack