CVE-2021-26028 [20210308] - Core - Path Traversal within joomla/archive zip class

What is CVE-2021-26028?

CVE-2021-26028 is a medium-severity path traversal vulnerability in Joomla Joomla\!, published on 4 Mar 2021. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

Official description

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.

Weakness: CWE-22

Which versions are affected by CVE-2021-26028?

3 open source packages ship an affected version, including joomla/archive and joomla. It affects 1 product.

Products include Joomla Joomla\!.

How do I fix CVE-2021-26028?

Upgrade joomla/archive to 1.1.10 or later.

Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.

Is CVE-2021-26028 being exploited?

There is no known exploitation of CVE-2021-26028 in the wild and no public exploit code.

Other vulnerabilities in Joomla Joomla\!

• CVE-2016-10033 PHPMailer Command Injection Exploited Critical 9.8
• CVE-2023-23752 Joomla! Improper Access Control Exploited Medium 5.3
• CVE-2026-48902 Joomla! Core - [20260518] - Transport encryption downgrade for password and username reset links Critical 9.8
• CVE-2025-25226 [20250401] - Joomla Framework - SQL injection vulnerability in quoteNameStr method of Database package Critical 9.8
• CVE-2022-23795 [20220303] - Core - User row are not bound to a authentication mechanism Critical 9.8

All Joomla Joomla\! vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BIT-joomla-2021-26028, GHSA-vgwr-773q-7j3c.