CVE-2023-42452 (published 2023-09-19T15:58:44.559Z)
Mastodon is a free, open-source social network server based on ActivityPub. In versions on the 4.x branch prior to versions 4.0.10, 4.2.8, and 4.2.0-rc2, under certain conditions, attackers can abuse the translation feature to bypass the server-side HTML sanitization, allowing unescaped HTML to execute in the browser. The impact is limited thanks to Mastodon's strict Content Security Policy, blocking inline scripts, etc. However a CSP bypass or loophole could be exploited to execute malicious XSS. Furthermore, it requires user interaction, as this can only occur upon clicking the “Translate” button on a malicious post. Versions 4.0.10, 4.2.8, and 4.2.0-rc2 contain a patch for this issue.
Affected products: Vendor: mastodon
Product: mastodon
Versions: >= 4.0.0, < 4.0.10, >= 4.1.0, < 4.1.8, >= 4.2.0-beta1, < 4.2.0-rc2