Package Instance

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
TYPO3 Fluid Engine (package `typo3fluid/fluid`) before versions 2.0.5, 2.1.4, 2.2.1, 2.3.5, 2.4.1, 2.5.5 or 2.6.1 is vulnerable to cross-site scripting when making use of the ternary conditional operator in templates like `{showFullName ? fullName : defaultValue}`. Updated versions of this package are bundled in following TYPO3 (`typo3/cms-core`) versions as well: TYPO3 v8.7.25 (using `typo3fluid/fluid` v2.5.4) and TYPO3 v9.5.6 (using `typo3fluid/fluid` v2.6.1).

Cross-site Scripting
TYPO3 Fluid is vulnerable to Cross-Site Scripting. Three XSS vulnerabilities have been detected in Fluid - `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. `ViewHelpers` which used the `CompileWithContentArgumentAndRenderStatic` trait, and which declared escapeOutput = false, would receive the content argument in unescaped format. Subclasses of `AbstractConditionViewHelper` would receive the then and else arguments in unescaped format. More details are available in the linked advisory.