In haml versions prior to version 5.0.0.beta.2, when using user input to perform tasks on the server, characters like < > " ’ must be escaped properly. In this case, the ’ character was missed. An attacker can manipulate the input to introduce additional attributes, potentially executing code.
[
{
"product": "haml",
"vendor": "http://haml.info/",
"versions": [
{
"status": "affected",
"version": "All versions prior to version 5.0.0.beta.2"
}
]
}
]