CVE-2023-42452
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.
| Software | From | Fixed in |
|---|---|---|
| joinmastodon / mastodon | 4.2.0-beta1 | 4.2.0-beta1.x |
| joinmastodon / mastodon | 4.2.0-beta2 | 4.2.0-beta2.x |
| joinmastodon / mastodon | 4.2.0-beta3 | 4.2.0-beta3.x |
| joinmastodon / mastodon | 4.2.0-rc1 | 4.2.0-rc1.x |
| joinmastodon / mastodon | 4.1.0 | 4.1.8 |
| joinmastodon / mastodon | 4.0.0 | 4.0.10 |
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