CVE-2026-27468

描述

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 update their systems. Servers not using the experimental feature flag `fasp` are not affected.

如何修補 CVE-2026-27468

要修補 CVE-2026-27468,請將受影響套件升級到下列已修補版本。

• —升級至 4.4.14 或更新版本

CVE-2026-27468 正在被利用嗎?

低 — EPSS 為 0.3%,目前沒有觀察到大規模利用活動。

受影響套件(1)

• >= 4.4.0, < 4.4.14, >= 4.5.0, < 4.5.7

CVSS 分數

參考連結(3)

• WEBgithub.com/mastodon/mastodon/commit/6ba6285a73c3a8b281123814d45f534e3bcebb96
• WEBgithub.com/mastodon/mastodon/security/advisories/GHSA-qgmm-vr4c-ggjg
• WEBnvd.nist.gov/vuln/detail/CVE-2026-27468