CVE-2026-33868 in Mastodoninformación

Resumen (Inglés)

Mastodon is a free, open-source social network server based on ActivityPub. Prior to versions 4.5.8, 4.4.15, and 4.3.21, an unauthenticated Open Redirect vulnerability (CWE-601) exists in the `/web/*` route due to improper handling of URL-encoded path segments. An attacker can craft a specially encoded URL that causes the application to redirect users to an arbitrary external domain, enabling phishing attacks and potential OAuth credential theft. The issue occurs because URL-encoded slashes (`%2F`) bypass Rails path normalization and are interpreted as host-relative redirects. Versions 4.5.8, 4.4.15, and 4.3.21 patch the issue.

Responsable

GitHub_M

Reservar

2026-03-24

Divulgación

2026-03-27

Voces

VulDB provides additional information and datapoints for this CVE:

IDVulnerabilidadCWEExpConCVE
354023Mastodon URL web Redirect601No está definidoArreglo oficialCVE-2026-33868

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