CVE-2021-21338 Open Redirection in Login Handling

What is CVE-2021-21338?

CVE-2021-21338 is a medium-severity vulnerability in Typo3 Typo3, published on 23 Mar 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

TYPO3 is an open source PHP based web content management system. In TYPO3 before versions 6.2.57, 7.6.51, 8.7.40, 9.5.25, 10.4.14, 11.1.1 it has been discovered that Login Handling is susceptible to open redirection which allows attackers redirecting to arbitrary content, and conducting phishing attacks. No authentication is required in order to exploit this vulnerability. This is fixed in versions 6.2.57, 7.6.51, 8.7.40, 9.5.25, 10.4.14, 11.1.1.

Weakness: CWE-601

Which versions are affected by CVE-2021-21338?

19 open source packages ship an affected version, including typo3/cms-core, typo3 and typo3/cms. It affects 1 product.

Products include Typo3 Typo3.

How do I fix CVE-2021-21338?

Upgrade typo3/cms-core to a fixed version for your release line: 10.4.14, 11.1.1, 6.2.57 or 7.6.51.

Is CVE-2021-21338 being exploited?

There is no known exploitation of CVE-2021-21338 in the wild and no public exploit code.

Other vulnerabilities in Typo3 Typo3

• CVE-2009-0258 Indexed Search Engine for TYPO3 Command Execution via Metacharacter Injection Critical 10.0
• CVE-2011-3583 Typo3 SQL injection due to faulty prepared statements Critical 9.8
• CVE-2011-4628 Typo3 Authentication Bypass Critical 9.8
• CVE-2023-24814 Persisted Cross-Site Scripting in Frontend Rendering in typo3 High 8.8
• CVE-2021-41113 Cross-Site-Request-Forgery in Backend URI Handling in Typo3 High 8.8

All Typo3 Typo3 vulnerabilities

Sources

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

Also known as BIT-typo3-2021-21338, GHSA-4jhw-2p6j-5wmp.