| Package | Affected versions | Patched versions |
|---|---|---|
| showdown | < 1.9.1 | 1.9.1 |
Versions of showdown prior to 1.9.1 are vulnerable to Reverse Tabnabbing. The package uses target='_blank' in anchor tags, allowing attackers to access window.opener for the original page when opening links. This is commonly used for phishing attacks.
Upgrade to version 1.9.1 or later.
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