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OpenAdvisories
Medium · 4.3 CVE-2025-62175 EUVD-2025-34112

Mastodon streaming API fails to disconnect disabled and suspended users

Published Oct 13, 2025 · Updated Oct 14, 2025 · Assigned by GitHub_M

Description

Mastodon is a free, open-source social network server based on ActivityPub. In versions before 4.4.6, 4.3.14, and 4.2.27, disabling or suspending a user account does not disconnect the account from the streaming API. This allows disabled or suspended accounts to continue receiving real-time updates through existing streaming connections and to establish new streaming connections, even though they cannot interact with other API endpoints. This undermines moderation actions, as administrators expect disabled or suspended accounts to be fully disconnected from the service. This issue has been patched in versions 4.4.6, 4.3.14, and 4.2.27. No known workarounds exist.

Affected products

VendorProductAffectedFixed
mastodon mastodon >= 4.4.0-beta.1, < 4.4.6, >= 4.3.0-beta.1, < 4.3.14, < 4.2.27 —

References