CVE-2021-21358

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in typo3/cms-form

MEDIUM
5.4
CVSS Score
Published: March 23, 2021 at 01:50 AM UTC
Updated: June 17, 2026 at 03:35 AM UTC
1 product affected across 1 vendorTYPO3

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Severity
MEDIUM5.4
Exploit prediction
EPSS 0.9%

Description

TYPO3 is an open source PHP based web content management system. In TYPO3 before versions 10.4.14, 11.1.1 it has been discovered that the Form Designer backend module of the Form Framework is vulnerable to cross-site scripting. A valid backend user account with access to the form module is needed to exploit this vulnerability. This is fixed in versions 10.4.14, 11.1.1.

Affected

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

95%
v ≤ 10.4.13v ≤ 11.1.010.2.0 ≤ v < 10.4.1411.0.0 ≤ v < 11.1.1
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

Remediation

No guide yet

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

References (3)

CVSS

5.4MEDIUMGitHub_M
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-79

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