CVE-2021-21338
Open Redirection in Login Handling
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Required
What an attacker can affect
- Confidentiality
- None
- Integrity
- Low
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
Open Redirection in Login Handling
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.
- Record
CVE-2021-21338- CVSS 3.1
- 4.7 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N - Weakness
- CWE-601
- Updated
- 2026-11-02
EUVDEUVD-2021-0597
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.
- Record
EUVD-2021-0597- CVSS 3.1
- 4.7 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-4jhw-2p6j-5wmp
Open Redirection in Login Handling
Problem
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.
Solution
Update to TYPO3 versions 6.2.57, 7.6.51, 8.7.40, 9.5.25, 10.4.14, 11.1.1 that fix the problem described.
Credits
Thanks to Alexander Kellner who reported this issue and to TYPO3 security team member Torben Hansen who fixed the issue.
References
- Record
GHSA-4jhw-2p6j-5wmp- CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - Weakness
- CWE-601
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2021-21338- CVSS 3.1
- 4.7 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N - CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - CVSS 2.0
- 5.8 Medium
AV:N/AC:M/Au:N/C:P/I:P/A:N - Weakness
- CWE-601
- Updated
- 2026-11-02
OSV
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.
- Record
CVE-2021-21338- CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - Updated
- 2026-11-02
OSVGHSA-4jhw-2p6j-5wmp
Open Redirection in Login Handling
Problem
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.
Solution
Update to TYPO3 versions 6.2.57, 7.6.51, 8.7.40, 9.5.25, 10.4.14, 11.1.1 that fix the problem described.
Credits
Thanks to Alexander Kellner who reported this issue and to TYPO3 security team member Torben Hansen who fixed the issue.
References
- Record
GHSA-4jhw-2p6j-5wmp- CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - Weakness
- CWE-601
- Updated
- 2026-11-02
OSVBIT-typo3-2021-21338 No score
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.
- Record
BIT-typo3-2021-21338- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
typo3/cms-corePackagist |
6.2.0 to 6.2.56 | 6.2.57 |
typo3/cms-corePackagist |
7.0.0 to 7.6.50 | 7.6.51 |
typo3/cms-corePackagist |
8.0.0 to 8.7.39 | 8.7.40 |
typo3/cms-corePackagist |
10.0.0 up to 10.4.14 | 10.4.14 |
typo3/cms-corePackagist |
11.0.0 up to 11.1.1 | 11.1.1 |
typo3/cms-corePackagist |
9.0.0 up to 9.5.25 | 9.5.25 |
typo3/cmsPackagist |
10.0.0 up to 10.4.14 | 10.4.14 |
typo3/cmsPackagist |
11.0.0 up to 11.1.1 | 11.1.1 |
typo3/cmsPackagist |
9.0.0 up to 9.5.25 | 9.5.25 |
typo3Bitnami |
6.2.0 up to 6.2.57, 7.0.0 up to 7.6.51, 8.0.0 up to 8.7.40, 9.0.0 up to 9.5.25, 10.0.0 up to 10.4.14, 11.0.0 up to 11.1.1 | 6.2.577.6.518.7.409.5.2510.4.1411.1.1 |
Show 9 moreShow less
| Package | Affected | Fixed |
|---|---|---|
typo3/cms-corePackagist |
6.2.0 up to 6.2.57 | 6.2.57 |
typo3/cms-corePackagist |
7.0.0 up to 7.6.51 | 7.6.51 |
typo3/cms-corePackagist |
8.0.0 up to 8.7.40, plus listed versions v8.7.10v8.7.11v8.7.12v8.7.13v8.7.14 Show 21 moreShow lessv8.7.15v8.7.16v8.7.17v8.7.18v8.7.19v8.7.20v8.7.21v8.7.22v8.7.23v8.7.24v8.7.25v8.7.26v8.7.27v8.7.28v8.7.29v8.7.30v8.7.31v8.7.32v8.7.7v8.7.8v8.7.9 |
8.7.40 |
typo3/cms-corePackagist |
10.0.0 up to 10.4.14, plus listed versions v10.0.0v10.1.0v10.2.0v10.2.1v10.2.2 Show 15 moreShow lessv10.3.0v10.4.0v10.4.1v10.4.10v10.4.11v10.4.12v10.4.13v10.4.2v10.4.3v10.4.4v10.4.5v10.4.6v10.4.7v10.4.8v10.4.9 |
10.4.14 |
typo3/cms-corePackagist |
11.0.0 up to 11.1.1, plus listed versions v11.0.0v11.1.0 |
11.1.1 |
typo3/cms-corePackagist |
9.0.0 up to 9.5.25, plus listed versions v9.0.0v9.1.0v9.2.0v9.2.1v9.3.0 Show 29 moreShow lessv9.3.1v9.3.2v9.3.3v9.4.0v9.5.0v9.5.1v9.5.10v9.5.11v9.5.12v9.5.13v9.5.14v9.5.15v9.5.16v9.5.17v9.5.18v9.5.19v9.5.2v9.5.20v9.5.21v9.5.22v9.5.23v9.5.24v9.5.3v9.5.4v9.5.5v9.5.6v9.5.7v9.5.8v9.5.9 |
9.5.25 |
typo3/cmsPackagist |
10.0.0 up to 10.4.14, plus listed versions v10.0.0v10.1.0v10.2.0v10.2.1v10.2.2 Show 15 moreShow lessv10.3.0v10.4.0v10.4.1v10.4.10v10.4.11v10.4.12v10.4.13v10.4.2v10.4.3v10.4.4v10.4.5v10.4.6v10.4.7v10.4.8v10.4.9 |
10.4.14 |
typo3/cmsPackagist |
11.0.0 up to 11.1.1, plus listed versions v11.0.0v11.1.0 |
11.1.1 |
typo3/cmsPackagist |
9.0.0 up to 9.5.25, plus listed versions v9.0.0v9.1.0v9.2.0v9.2.1v9.3.0 Show 29 moreShow lessv9.3.1v9.3.2v9.3.3v9.4.0v9.5.0v9.5.1v9.5.10v9.5.11v9.5.12v9.5.13v9.5.14v9.5.15v9.5.16v9.5.17v9.5.18v9.5.19v9.5.2v9.5.20v9.5.21v9.5.22v9.5.23v9.5.24v9.5.3v9.5.4v9.5.5v9.5.6v9.5.7v9.5.8v9.5.9 |
9.5.25 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-21338 is a medium vulnerability (CVSS 4.7) in Typo3, published March 23, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.10%, the 65th percentile. Fixed in typo3/cms-core 6.2.57.
References
github.com/TYPO3/TYPO3.CMS/security/advisories/GHSA-4jhw-2p6j-5wmp
packagist.org/packages/typo3/cms-core
typo3.org/security/advisory/typo3-core-sa-2021-001
nvd.nist.gov/vuln/detail/CVE-2021-21338