Smashing 1.3.4 is vulnerable to Cross Site Scripting (XSS). A URL for a widget can be crafted and used to execute JavaScript on the victim’s computer. The JavaScript code can then steal data available in the session/cookies depending on the user environment (e.g. if re-using internal URL’s for deploying, or cookies that are very permissive) private information may be retrieved by the attacker.
github.com/rubysec/ruby-advisory-db/blob/master/gems/smashing/CVE-2021-35440.yml
github.com/Smashing/smashing
github.com/Smashing/smashing/blob/ad7325f159f89854ca4e7d94e7be9bee507b6d46/CHANGELOG.md
github.com/Smashing/smashing/pull/186
github.com/Smashing/smashing/pull/186/commits/f4648137ae77aa2a9ccd14b2e6eeaed2cfb32da3
nvd.nist.gov/vuln/detail/CVE-2021-35440