CVE-2021-21338 - CVE House
Back to Database
Status published Medium CVE-2021-21338

Open Redirection in Login Handling

Vulnerability 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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

THREAT MONITOR

Am I Vulnerable?

Launch our assessment wizard to check if your infrastructure is exposed to • CVE-2021-21338

Credits & Attribution

No credits recorded in the NVD database.

References

More from TYPO3

View All →
CVE-2025-9573
Command Injection in extension "TYPO3 Backup Plus" (ns_backup)
High 8.6
CVE-2025-7900
Insecure Direct Object Reference in extension "femanager" (femanager)
Medium 5.3
CVE-2025-7899
Insecure Direct Object Reference in extension "powermail" (powermail)
Medium 6
CVE-2025-59022
TYPO3 CMS Allows Broken Access Control in Recycler Module
High 7.1
CVE-2025-59021
TYPO3 CMS Allows Broken Access Control in Redirects Module
Medium 5.3

Affected Vendor

Affected Software

TYPO3.CMS
Vulnerable Versions:
>= 6.2.0, <= 6.2.56, >= 7.0.0, <= 7.6.50, >= 8.0.0, <= 8.7.39, >= 9.0.0, <= 9.5.24, >= 10.0.0, <= 10.4.13, >= 11.0.0, <= 11.1.0

Timeline

Official Publish: March 23rd, 2021
Last Modified: August 3rd, 2024
Added to House: July 21st, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N

Weaknesses (CWE)

CWE-601

MITRE ATT&CK TTPs

T1566 Phishing
Initial Access
T1204 User Execution
Execution
T1071 Application Layer Protocol
Command and Control
T1189 Drive-by Compromise
Initial Access
T1036 Masquerading
Defense Evasion