An issue was discovered in Joomla!

published 2020-01-28 6 y ago modified 2026-09-08 2 mo ago also BIT-joomla-2020-8420 , EUVD-2020-29287

cvss: 8.8; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.7%; EPSS 0.7% chance of exploitation in 30 days, percentile 54%
public exploits: 0; none known

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.

Patch / fix

fixed in 2

bitnami joomla 3.9.15
joomla joomla! 3.9.15

Exploit prediction

0.74% chance of exploitation in the next 30 days, higher than 54% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.1	8.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD	2.0	6.8	AV:N/AC:M/Au:N/C:P/I:P/A:P
OSV	3.1	8.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected packages

ecosystem	package	affected	fixed in
bitnami	joomla	>=3.0.0, <3.9.15	3.9.15

Classification

Weakness

CWE-352 Cross-Site Request Forgery

References

developer.joomla.org /security-centre/799-20200102-core-csrf-com-templates-less-compiler
vendor-advisory, advisory
nvd.nist.gov /vuln/detail/CVE-2020-8420
web

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary