CVE-2026-23961 Mastodon may allow a remote suspension bypass

Mastodon is a free, open-source social network server based on ActivityPub. Mastodon allows server administrators to suspend remote users to prevent interactions. However, some logic errors allow already-known posts from such suspended users to appear in timelines if boosted. Furthermore, under...

CVE-2026-23961

Summary of CVE-2026-23961 (Mastodon): A logic flaw in how suspended remote users are handled allows old posts from those users to appear in timelines, and under some circumstances, newly created posts from suspended users can be processed and surfaced. Affected releases span multiple lines: v4.5....