CVE-2026-27468
HighSummary
Mastodon to darmowy, otwartoźródłowy serwer sieci społecznościowej oparty na ActivityPub. W wersjach 4.4.0 do 4.4.13 oraz 4.5.0 do 4.5.6, działania wykonywane przez FASP w celu subskrypcji zdarzeń związanych z kontem/treścią nie sprawdzały poprawnie, czy FASP został zatwierdzony przez administratora. Problem ten dotyczy serwerów Mastodon, które włączyły eksperymentalną funkcję FASP.
Risk Assessment
Atakujący może dokonywać subskrypcji i żądać uzupełnienia treści bez zatwierdzenia przez administratora, co prowadzi do niewielkiego wycieku informacji oraz może stanowić poważne zagrożenie dla dostępności serwera poprzez obciążenie pracownika sidekiq odpowiedzialnego za kolejkę FASP.
Recommendation
Zaleca się aktualizację do wersji 4.4.14 lub 4.5.7, aby usunąć tę podatność. Administratorzy testujący eksperymentalną funkcję FASP powinni niezwłocznie przeprowadzić aktualizację.
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Original NVD description (English source)
Mastodon is a free, open-source social network server based on ActivityPub. FASP registration requires manual approval by an administrator. In versions 4.4.0 through 4.4.13 and 4.5.0 through 4.5.6, actions performed by a FASP to subscribe to account/content lifecycle events or to backfill content did not check properly whether the FASP was actually approved. This only affects Mastodon servers that have opted in to testing the experimental FASP feature by setting the environment variable `EXPERIMENTAL_FEATURES` to a value including `fasp`. An attacker can make subscriptions and request content backfill without approval by an administrator. Done once, this leads to minor information leak of URIs that are publicly available anyway. But done several times this is a serious vector for DOS, putting pressure on the sidekiq worker responsible for the `fasp` queue. The fix is included in the 4.4.14 and 4.5.7 releases. Admins that are actively testing the experimental "fasp" feature should updat