CVE-2023-36459

Description

Mastodon is a free, open-source social network server based on ActivityPub. Starting in version 1.3 and prior to versions 3.5.9, 4.0.5, and 4.1.3, an attacker using carefully crafted oEmbed data can bypass the HTML sanitization performed by Mastodon and include arbitrary HTML in oEmbed preview cards. This introduces a vector for cross-site scripting (XSS) payloads that can be rendered in the user's browser when a preview card for a malicious link is clicked through. Versions 3.5.9, 4.0.5, and 4.1.3 contain a patch for this issue.

References

https://github.com/mastodon/mastodon/security/advisories/GHSA-ccm4-vgcc-73hp

https://github.com/mastodon/mastodon/releases/tag/v4.1.3

https://github.com/mastodon/mastodon/releases/tag/v4.0.5

https://github.com/mastodon/mastodon/releases/tag/v3.5.9

https://github.com/mastodon/mastodon/commit/6d8e0fae3e96f3cf4febe03fa7fcf5b95ff761b2

http://www.openwall.com/lists/oss-security/2023/07/06/5

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3