What is CVE-2021-26028?

CVE-2021-26028 is a medium-severity vulnerability in Joomla Joomla\!, classified under Path Traversal. CVSS score: 5.5/10. Published 2021-03-04.

How severe is CVE-2021-26028?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Is CVE-2021-26028 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Path Traversal in Joomla Joomla\!

CVE-2021-26028

An issue was discovered in Joomla! 3.0.0 through 3.9.24. Extracting an specifilcy crafted zip package could write files outside of the intended path.

Vulnerability class: Path Traversal (Directory Traversal)

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

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.010 (61.7th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 62nd percentile — 61.7% 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 3.0.0-3.9.24

Weakness classification (CWE)

CWE-22 — Path Traversal

Public proof-of-concept exploits

ARPSyndicate/cvemon

References

developer.joomla.org/security-centre/848-20210308-core-path-traversal-within-jo… (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2021-26028?: CVE-2021-26028 is a medium-severity vulnerability in Joomla Joomla\!, classified under Path Traversal. CVSS score: 5.5/10. Published 2021-03-04.
How severe is CVE-2021-26028?: Medium severity. CVSS v3 base score is 5.5 out of 10.
Is CVE-2021-26028 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.