Vulnerability CVE-2023-36462
Published: 2023-07-06

Description:
Mastodon is a free, open-source social network server based on ActivityPub. Starting in version 2.6.0 and prior to versions 3.5.9, 4.0.5, and 4.1.3, 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. Versions 3.5.9, 4.0.5, and 4.1.3 contain a patch for this issue.

Type:

CWE-20

 (Improper Input Validation)

 References:
https://github.com/mastodon/mastodon/commit/610731b03dfcadd887078cb0399f4e514aa1931c
https://github.com/mastodon/mastodon/releases/tag/v3.5.9
https://github.com/mastodon/mastodon/releases/tag/v4.0.5
https://github.com/mastodon/mastodon/security/advisories/GHSA-55j9-c3mp-6fcq
https://github.com/mastodon/mastodon/releases/tag/v4.1.3
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