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Cross-Site Scripting in Fluid view helpers

Moderate severity GitHub Reviewed Published Nov 17, 2020 in TYPO3/typo3 • Updated Feb 1, 2024

Package

composer typo3/cms (Composer)

Affected versions

>= 10.0.0, < 10.4.10
>= 9.0.0, < 9.5.23
>= 8.7.0, < 8.7.38

Patched versions

10.4.10
9.5.23
8.7.38
composer typo3/cms-core (Composer)
>= 9.0.0, < 9.5.23
>= 10.0.0, < 10.4.10
>= 8.7.0, < 8.7.38
9.5.23
10.4.10
8.7.38

Description

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

References

@ohader ohader published to TYPO3/typo3 Nov 17, 2020
Reviewed Dec 21, 2020
Published to the GitHub Advisory Database Dec 21, 2020
Last updated Feb 1, 2024

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS score

0.112%
(46th percentile)

Weaknesses

CVE ID

CVE-2020-26227

GHSA ID

GHSA-vqqx-jw6p-q3rf

Source code

No known source code

Credits

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