TYPO3 Fluid before versions 2.0.8, 2.1.7, 2.2.4, 2.3.7, 2.4.4, 2.5.11 and 2.6.10 is vulnerable to Cross-Site Scripting. Three XSS vulnerabilities have been detected in Fluid: 1. TagBasedViewHelper allowed XSS through maliciously crafted additionalAttributes arrays by creating keys with attribute-closing quotes followed by HTML. When rendering such attributes, TagBuilder would not escape the keys. 2. ViewHelpers which used the CompileWithContentArgumentAndRenderStatic trait, and which declared escapeOutput = false, would receive the content argument in unescaped format. 3. Subclasses of AbstractConditionViewHelper would receive the then and else arguments in unescaped format. Update to versions 2.0.8, 2.1.7, 2.2.4, 2.3.7, 2.4.4, 2.5.11 or 2.6.10 of this typo3fluid/fluid package that fix the problem described. More details are available in the linked advisory.
Affected: Packagist: typo3fluid/fluid
> ### 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
Three XSS vulnerabilities have been detected in Fluid:
1. TagBasedViewHelper allowed XSS throug maliciously crafted `additionalAttributes` arrays by creating keys with attribute-closing quotes followed by HTML. When rendering such attributes, TagBuilder would not escape the keys. 2. ViewHelpers which used the `CompileWithContentArgumentAndRenderStatic` trait, and which declared `escapeOutput = false`, would receive the content argument in unescaped format. 3. Subclasses of AbstractConditionViewHelper would receive the `then` and `else` arguments in unescaped format.
### Solution Update to versions 2.0.8, 2.1.7, 2.2.4, 2.3.7, 2.4.4, 2.5.11 or 2.6.10 of this `typo3fluid/fluid` package that fix the problem described.
Updated versions of this package are bundled in following TYPO3 (`typo3/cms-core`) releases:
* TYPO3 v9.5.23 (using typo3fluid/fluid v2.6.10) * TYPO3 v10.4.10 (using typo3fluid/fluid v2.6.10)
The specific vulnerabilities are prevented by:
1. Explicitly escaping keys found in the `additionalAttributes` array passed to a TagBasedViewHelper before using them as attribute names. 2. Detecting "content argument" on ViewHelpers using the trait CompileWithContentArgumentAndRenderStatic and escaping it based on the state of `escapeChildren` when `escapeOutput` is toggled off. Escaping still will not occur if explicitly disabled by an enclosing ViewHelper. T…