Mediawiki · Mediawiki · CVE-2019-19709
**Name of the Vulnerable Software and Affected Versions**
MediaWiki versions prior to 1.33.1
**Description**
The issue allows attackers to bypass the Title blacklist protection mechanism. This can be achieved by starting with an arbitrary title, establishing a non-resolvable redirect for the associated page, and using `redirect=1` in the "action API" when editing that page. The vulnerability is related to redirecting URLs to untrusted sites, which can allow a remote attacker to gain unauthorized access to confidential data and impact data integrity.
**Recommendations**
For MediaWiki versions prior to 1.33.1, update to a version that contains a fix for this issue.
As a temporary workaround, consider restricting the use of the `redirect=1` parameter in the action API until a patch is available.