CVE-2021-21338: TYPO3

Medium severity, CVSS 6.1. EPSS: 1.1% chance of exploitation in the next 30 days.

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.

Affected products

• TYPO3 TYPO3: from 6.2.0, before 6.2.57 (fixed in 6.2.57); from 7.0.0, before 7.6.51 (fixed in 7.6.51); from 8.0.0, before 8.7.40 (fixed in 8.7.40); from 9.0.0, before 9.5.25 (fixed in 9.5.25); from 10.0.0, before 10.4.14 (fixed in 10.4.14); from 11.0.0, before 11.1.1 (fixed in 11.1.1)

Published 2021-03-23. Last modified 2026-06-17.