CVE-2026-47777 Mastodon has a consent-check bypass in its remote Collections

Mastodon is a free, open-source social network server based on ActivityPub. In versions there is a missing condition in the check if remote accounts consented to be featured in a remote Collection could lead to attackers bypassing the check and faking consent. An attacker could forge the...

CVE-2026-47777

Affected product: Mastodon (open-source social network server). Vulnerable component: remote Collections feature logic for consent verification. Root cause: missing condition to ensure the FeatureAuthorization object on a remote account actually matches the Collection item, allowing forging of co...