CVE-2026-71573 Joomla! Core - [20260802] - Improper CORS origin validation in Joomla 4.0.0-5.4.7, 6.0.0-6.1.2
Attackers can bypass CORS restrictions due to improper origin validation, potentially enabling cross-origin attacks against configured origins.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-71573?
CVE-2026-71573 is a medium-severity vulnerability in Joomla Joomla\!, published on 18 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Joomla! Core - [20260802] - Improper CORS origin validation in Joomla 4.0.0-5.4.7, 6.0.0-6.1.2 - An improper implementation prevented configured CORS origins from being properly validated in CORS requests.
Weakness: CWE-93
Which versions are affected by CVE-2026-71573?
1 open source package ship an affected version, including joomla. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
joomla Bitnami | From 4.0.0 | 5.4.8, 6.1.3 |
Products include Joomla Joomla\!.
How do I fix CVE-2026-71573?
Upgrade joomla to a fixed version for your release line: 5.4.8 or 6.1.3.
Is CVE-2026-71573 being exploited?
There is no known exploitation of CVE-2026-71573 in the wild and no public exploit code.
Other vulnerabilities in Joomla Joomla\!
- CVE-2016-10033 PHPMailer Command Injection
- CVE-2023-23752 Joomla! Improper Access Control
- CVE-2026-48902 Joomla! Core - [20260518] - Transport encryption downgrade for password and username reset links
- CVE-2025-25226 [20250401] - Joomla Framework - SQL injection vulnerability in quoteNameStr method of Database package
- CVE-2022-23795 [20220303] - Core - User row are not bound to a authentication mechanism
Sources
Also known as BIT-joomla-2026-71573, GHSA-jm8r-mhmw-h747.