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CVE-2021-21358

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

5.4 MediumFix available

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
Low
User interaction
Required

What an attacker can affect

Confidentiality
Low
Integrity
Low
Availability
None

Exploit likelihood

0.87%Unchanged since Apr 14, 2021
90%50%10%1%

What each source reports

CVE List Score used 5.4

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

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.

Record
CVE-2021-21358
CVSS 3.1
5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Weakness
CWE-79
Updated
2026-11-02
EUVDEUVD-2021-0722 5.4

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.

Record
EUVD-2021-0722
CVSS 3.1
5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Updated
2026-11-03
GitHub AdvisoriesGHSA-x79j-wgqv-g8h2 5.0

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

Problem

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.

Solution

Update to TYPO3 versions 10.4.14 or 11.1.1 that fix the problem described.

Credits

Thanks to Richie Lee who reported this issue and to TYPO3 framework merger Andreas Fernandez who fixed the issue.

References

Record
GHSA-x79j-wgqv-g8h2
CVSS 3.1
5.0 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N/E:F/RL:O/RC:C
Weakness
CWE-79
Updated
2026-11-02
NVD 5.4

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.

Record
CVE-2021-21358
CVSS 3.1
5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
CVSS 2.0
3.5 LowAV:N/AC:M/Au:S/C:N/I:P/A:N
Weakness
CWE-79
Updated
2026-11-02
OSV 5.4

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.

Record
CVE-2021-21358
CVSS 3.1
5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Updated
2026-11-02
OSVGHSA-x79j-wgqv-g8h2 5.4

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

Problem

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.

Solution

Update to TYPO3 versions 10.4.14 or 11.1.1 that fix the problem described.

Credits

Thanks to Richie Lee who reported this issue and to TYPO3 framework merger Andreas Fernandez who fixed the issue.

References

Record
GHSA-x79j-wgqv-g8h2
CVSS 3.1
5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N/E:F/RL:O/RC:C
Weakness
CWE-79
Updated
2026-11-02
OSVBIT-typo3-2021-21358 No score

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.

Record
BIT-typo3-2021-21358
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
typo3/cms-form
Packagist
 10.2.0 to 10.4.13
10.4.14
typo3/cms-form
Packagist
 11.0.0 to 11.1.0
11.1.1
typo3/cms-core
Packagist
 10.0.0 up to 10.4.14
10.4.14
typo3/cms-core
Packagist
 11.0.0 up to 11.1.1
11.1.1
typo3/cms
Packagist
 10.0.0 up to 10.4.14
10.4.14
typo3/cms
Packagist
 11.0.0 up to 11.1.1
11.1.1
typo3
Bitnami
 10.2.0 up to 10.4.14, 11.0.0 up to 11.1.1
10.4.1411.1.1
typo3/cms-form
Packagist
 10.2.0 up to 10.4.14, plus listed versions
v10.2.0v10.2.1v10.2.2v10.3.0v10.4.0
Show 13 moreShow less
v10.4.1v10.4.10v10.4.11v10.4.12v10.4.13v10.4.2v10.4.3v10.4.4v10.4.5v10.4.6v10.4.7v10.4.8v10.4.9
10.4.14
typo3/cms-form
Packagist
 11.0.0 up to 11.1.1, plus listed versions
v11.0.0v11.1.0
11.1.1
typo3/cms-core
Packagist
 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 less
v10.3.0v10.4.0v10.4.1v10.4.10v10.4.11v10.4.12v10.4.13v10.4.2v10.4.3v10.4.4v10.4.5v10.4.6v10.4.7v10.4.8v10.4.9
10.4.14
typo3/cms-core
Packagist
 11.0.0 up to 11.1.1, plus listed versions
v11.0.0v11.1.0
11.1.1
typo3/cms
Packagist
 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 less
v10.3.0v10.4.0v10.4.1v10.4.10v10.4.11v10.4.12v10.4.13v10.4.2v10.4.3v10.4.4v10.4.5v10.4.6v10.4.7v10.4.8v10.4.9
10.4.14
typo3/cms
Packagist
 11.0.0 up to 11.1.1, plus listed versions
v11.0.0v11.1.0
11.1.1

History

History
RecordedChangedSources
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-21358 is a medium vulnerability (CVSS 5.4) in Typo3, published March 23, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.87%, the 59th percentile. Fixed in typo3/cms-form 10.4.14.

References

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