CVE-2021-21338

Open Redirection in Login Handling

MEDIUM

6.1

CVSS Score

Published: March 23, 2021 at 01:45 AM UTC

Updated: June 17, 2026 at 03:35 AM UTC

1 product affected across 1 vendorTYPO3

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Severity

MEDIUM6.1

Exploit prediction

EPSS 1%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

TYPO3 · TYPO3composer

95%

v ≤ 10.4.13v ≤ 11.1.0v ≤ 6.2.56v ≤ 7.6.50v ≤ 8.7.39v ≤ 9.5.2410.0.0 ≤ v < 10.4.1411.0.0 ≤ v < 11.1.16.2.0 ≤ v < 6.2.577.0.0 ≤ v < 7.6.518.0.0 ≤ v < 8.7.409.0.0 ≤ v < 9.5.25

Affected range stops below 10.4.14, so it looks safe — our inference, not a vendor statement

Affected range stops below 11.1.1, so it looks safe — our inference, not a vendor statement

Affected range stops below 6.2.57, so it looks safe — our inference, not a vendor statement

Affected range stops below 7.6.51, so it looks safe — our inference, not a vendor statement

Affected range stops below 8.7.40, so it looks safe — our inference, not a vendor statement

Affected range stops below 9.5.25, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://typo3.org/security/advisory/typo3-core-sa-2021-001

References (3)

x_refsource_CONFIRMThird Party Advisory

Source: [email protected]

https://github.com/TYPO3/TYPO3.CMS/security/advisories/GHSA-4jhw-2p6j-5wmp

x_refsource_MISCRelease NotesThird Party Advisory

Source: [email protected]

https://packagist.org/packages/typo3/cms-core

x_refsource_MISCVendor Advisory

Source: [email protected]

https://typo3.org/security/advisory/typo3-core-sa-2021-001

CVSS

6.1MEDIUM[email protected]

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: REQUIRED
Scope: CHANGED
Confidentiality: LOW
Integrity: LOW
Availability: NONE

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-601

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