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.
| Package (Ecosystem) | Introduced | Fixed | Limit |
|---|---|---|---|
| haml(RubyGems) | 0 | 5.0.0 | N/A |
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