Security Advisory

CVE-2023-36459

CVE vulnerability detail — eXtreme Datacenter Security Operations

Published 2023-07-06 18:29:07

Last updated 2025-02-13 16:56:17

Assigner GitHub_M

State PUBLISHED

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 users 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.

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