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BIT-MASTODON-2026-33868 Mastodon has a GET-Based Open Redirect via '/web/%2F<domain>'

🗓️ 31 Mar 2026 08:45:35Reported by GoogleType 
osv
 osv
🔗 osv.dev👁 8 Views

Mastodon before versions 4.5.8, 4.4.15, and 4.3.21 have an unauthenticated open redirect via /web/%2F<domain>.

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02 Apr 2026 13:41Current
6Medium risk
Vulners AI Score6
CVSS 3.14.3 - 6.1
EPSS0.00515
SSVC
8