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CVE-2026-27477 Mastodon has SSRF via unvalidated FASP Provider base_url

🗓️ 24 Feb 2026 19:00:20Reported by GoogleType 
osv
 osv
🔗 osv.dev👁 4 Views

Unauthenticated FASP registration may cause Mastodon to reach internal addresses via the base URL when the experimental feature is enabled; fixed in version four point four fourteen and four point five seven.

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02 Apr 2026 13:21Current
5.8Medium risk
Vulners AI Score5.8
CVSS 48.2
EPSS0.00093
4