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CVE-2020-26227

Cross-Site Scripting in Fluid view helpers

6.1 MediumFix available

TYPO3 is an open source PHP based web content management system. In TYPO3 before versions 9.5.23 and 10.4.10 the system extension Fluid (typo3/cms-fluid) of the TYPO3 core is vulnerable to cross-site scripting passing user-controlled data as argument to Fluid view helpers. Update to TYPO3 versions 9.5.23 or 10.4.10 that fix the problem described.

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
Low
Integrity
Low
Availability
None

Exploit likelihood

0.72%Up 0.1 points since Apr 14, 2021
90%50%10%1%

What each source reports

CVE List Score used 6.1

Cross-Site Scripting in Fluid view helpers

TYPO3 is an open source PHP based web content management system. In TYPO3 before versions 9.5.23 and 10.4.10 the system extension Fluid (typo3/cms-fluid) of the TYPO3 core is vulnerable to cross-site scripting passing user-controlled data as argument to Fluid view helpers. Update to TYPO3 versions 9.5.23 or 10.4.10 that fix the problem described.

Record
CVE-2020-26227
CVSS 3.1
6.1 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness
CWE-79
Updated
2026-11-02
EUVDEUVD-2020-1506 6.1

TYPO3 is an open source PHP based web content management system. In TYPO3 before versions 9.5.23 and 10.4.10 the system extension Fluid (typo3/cms-fluid) of the TYPO3 core is vulnerable to cross-site scripting passing user-controlled data as argument to Fluid view helpers. Update to TYPO3 versions 9.5.23 or 10.4.10 that fix the problem described.

Record
EUVD-2020-1506
CVSS 3.1
6.1 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Updated
2026-11-03
GitHub AdvisoriesGHSA-vqqx-jw6p-q3rf 6.1

Cross-Site Scripting in Fluid view helpers

Meta

  • CVSS: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:F/RL:O/RC:C (5.7)
  • CWE-79

Problem

It has been discovered that system extension Fluid (typo3/cms-fluid) of the TYPO3 core is vulnerable to cross-site scripting passing user-controlled data as argument to Fluid view helpers.

<f:form ... fieldNamePrefix="{payload}" />
<f:be.labels.csh ... label="{payload}" />
<f:be.menus.actionMenu ... label="{payload}" />

Solution

Update to TYPO3 versions 9.5.23 or 10.4.10 that fix the problem described.

Credits

Thanks to TYPO3 security team member Oliver Hader who reported this issue and to TYPO3 security team members Helmut Hummel & Oliver Hader who fixed the issue.

References

Record
GHSA-vqqx-jw6p-q3rf
CVSS 3.1
6.1 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness
CWE-79
Updated
2026-11-02
NVD 6.1

TYPO3 is an open source PHP based web content management system. In TYPO3 before versions 9.5.23 and 10.4.10 the system extension Fluid (typo3/cms-fluid) of the TYPO3 core is vulnerable to cross-site scripting passing user-controlled data as argument to Fluid view helpers. Update to TYPO3 versions 9.5.23 or 10.4.10 that fix the problem described.

Record
CVE-2020-26227
CVSS 3.1
6.1 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CVSS 2.0
4.3 MediumAV:N/AC:M/Au:N/C:N/I:P/A:N
Weakness
CWE-79
Updated
2026-11-02
OSV 6.1

TYPO3 is an open source PHP based web content management system. In TYPO3 before versions 9.5.23 and 10.4.10 the system extension Fluid (typo3/cms-fluid) of the TYPO3 core is vulnerable to cross-site scripting passing user-controlled data as argument to Fluid view helpers. Update to TYPO3 versions 9.5.23 or 10.4.10 that fix the problem described.

Record
CVE-2020-26227
CVSS 3.1
6.1 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Updated
2026-11-02
OSVGHSA-vqqx-jw6p-q3rf 6.1

Cross-Site Scripting in Fluid view helpers

Meta

  • CVSS: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:F/RL:O/RC:C (5.7)
  • CWE-79

Problem

It has been discovered that system extension Fluid (typo3/cms-fluid) of the TYPO3 core is vulnerable to cross-site scripting passing user-controlled data as argument to Fluid view helpers.

<f:form ... fieldNamePrefix="{payload}" />
<f:be.labels.csh ... label="{payload}" />
<f:be.menus.actionMenu ... label="{payload}" />

Solution

Update to TYPO3 versions 9.5.23 or 10.4.10 that fix the problem described.

Credits

Thanks to TYPO3 security team member Oliver Hader who reported this issue and to TYPO3 security team members Helmut Hummel & Oliver Hader who fixed the issue.

References

Record
GHSA-vqqx-jw6p-q3rf
CVSS 3.1
6.1 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness
CWE-79
Updated
2026-11-02
OSVBIT-typo3-2020-26227 No score

TYPO3 is an open source PHP based web content management system. In TYPO3 before versions 9.5.23 and 10.4.10 the system extension Fluid (typo3/cms-fluid) of the TYPO3 core is vulnerable to cross-site scripting passing user-controlled data as argument to Fluid view helpers. Update to TYPO3 versions 9.5.23 or 10.4.10 that fix the problem described.

Record
BIT-typo3-2020-26227
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
typo3/cms-core
Packagist
 9.0.0 up to 9.5.23
9.5.23
typo3/cms-core
Packagist
 10.0.0 up to 10.4.10
10.4.10
typo3/cms-core
Packagist
 8.7.0 up to 8.7.38
8.7.38
typo3/cms
Packagist
 10.0.0 up to 10.4.10
10.4.10
typo3/cms
Packagist
 9.0.0 up to 9.5.23
9.5.23
typo3/cms
Packagist
 8.7.0 up to 8.7.38
8.7.38
typo3
Bitnami
 6.2.0 up to 6.2.54, 7.6.0 up to 7.6.48, 8.7.0 up to 8.7.38, 9.0.0 up to 9.5.23, 10.0.0 up to 10.4.10
6.2.547.6.488.7.389.5.2310.4.10
typo3/cms-core
Packagist
 9.0.0 up to 9.5.23, plus listed versions
v9.0.0v9.1.0v9.2.0v9.2.1v9.3.0
Show 27 moreShow less
v9.3.1v9.3.2v9.3.3v9.4.0v9.5.0v9.5.1v9.5.10v9.5.11v9.5.12v9.5.13v9.5.14v9.5.15v9.5.16v9.5.17v9.5.18v9.5.19v9.5.2v9.5.20v9.5.21v9.5.22v9.5.3v9.5.4v9.5.5v9.5.6v9.5.7v9.5.8v9.5.9
9.5.23
typo3/cms-core
Packagist
 10.0.0 up to 10.4.10, plus listed versions
v10.0.0v10.1.0v10.2.0v10.2.1v10.2.2
Show 11 moreShow less
v10.3.0v10.4.0v10.4.1v10.4.2v10.4.3v10.4.4v10.4.5v10.4.6v10.4.7v10.4.8v10.4.9
10.4.10
typo3/cms-core
Packagist
 8.7.0 up to 8.7.38, plus listed versions
v8.7.10v8.7.11v8.7.12v8.7.13v8.7.14
Show 21 moreShow less
v8.7.15v8.7.16v8.7.17v8.7.18v8.7.19v8.7.20v8.7.21v8.7.22v8.7.23v8.7.24v8.7.25v8.7.26v8.7.27v8.7.28v8.7.29v8.7.30v8.7.31v8.7.32v8.7.7v8.7.8v8.7.9
8.7.38
typo3/cms
Packagist
 10.0.0 up to 10.4.10, plus listed versions
v10.0.0v10.1.0v10.2.0v10.2.1v10.2.2
Show 11 moreShow less
v10.3.0v10.4.0v10.4.1v10.4.2v10.4.3v10.4.4v10.4.5v10.4.6v10.4.7v10.4.8v10.4.9
10.4.10
typo3/cms
Packagist
 9.0.0 up to 9.5.23, plus listed versions
v9.0.0v9.1.0v9.2.0v9.2.1v9.3.0
Show 27 moreShow less
v9.3.1v9.3.2v9.3.3v9.4.0v9.5.0v9.5.1v9.5.10v9.5.11v9.5.12v9.5.13v9.5.14v9.5.15v9.5.16v9.5.17v9.5.18v9.5.19v9.5.2v9.5.20v9.5.21v9.5.22v9.5.3v9.5.4v9.5.5v9.5.6v9.5.7v9.5.8v9.5.9
9.5.23
typo3/cms
Packagist
 8.7.0 up to 8.7.38, plus listed versions
8.7.18.7.2v8.7.10v8.7.11v8.7.12
Show 27 moreShow less
v8.7.13v8.7.14v8.7.15v8.7.16v8.7.17v8.7.18v8.7.19v8.7.20v8.7.21v8.7.22v8.7.23v8.7.24v8.7.25v8.7.26v8.7.27v8.7.28v8.7.29v8.7.3v8.7.30v8.7.31v8.7.32v8.7.4v8.7.5v8.7.6v8.7.7v8.7.8v8.7.9
8.7.38

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-2020-26227 is a medium vulnerability (CVSS 6.1) in Typo3, published November 23, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.72%, the 54th percentile. Fixed in typo3/cms-core 9.5.23.

References

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