Narfed

**Name of the Vulnerable Software and Affected Versions** Mastodon versions 2.6.0 through 3.5.8 Mastodon versions 4.0.0 through 4.0.4 Mastodon versions 4.1.0 through 4.1.2 **Description** Mastodon is a free, open-source social network server based on ActivityPub. An attacker can craft a verified profile link using specific formatting to conceal arbitrary parts of the link, enabling it to appear to link to a different URL altogether. The link is visually misleading, but clicking on it will reveal the actual link. This can still be used for phishing, though, similar to IDN homograph attacks. **Recommendations** For Mastodon versions 2.6.0 through 3.5.8, update to version 3.5.9 or later. For Mastodon versions 4.0.0 through 4.0.4, update to version 4.0.5 or later. For Mastodon versions 4.1.0 through 4.1.2, update to version 4.1.3 or later.