What is CVE-2021-26029?

CVE-2021-26029 is a medium-severity vulnerability in Joomla Joomla\!. CVSS score: 5.3/10. Published 2021-03-04.

How severe is CVE-2021-26029?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Joomla Joomla\!

CVE-2021-26029

An issue was discovered in Joomla! 1.6.0 through 3.9.24. Inadequate filtering of form contents could allow to overwrite the author field.

Published 2021-03-04 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.010 (61.5th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 62nd percentile — 61.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: +0.000

Affected products

Joomla Joomla\!
Joomla! Project Cms — versions 1.6.0-3.9.24

References

developer.joomla.org/security-centre/849-20210309-core-inadequate-filtering-of-… (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2021-26029?: CVE-2021-26029 is a medium-severity vulnerability in Joomla Joomla\!. CVSS score: 5.3/10. Published 2021-03-04.
How severe is CVE-2021-26029?: Medium severity. CVSS v3 base score is 5.3 out of 10.