CVE-2026-33868
mediumPriorität · verfolgen · 24EPSS 0.005 · 41. PerzentilEUUSEPSS · bewertet 2026-10-27
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.
cvss
Technischer Schweregrad, 0–10. Eine Zeile je Quelle.
Basiswert 0–10 · höher = schwerwiegender · Vektor überfahren zum Auflösen
SSVC
Eine Handlungsentscheidung — aus Ausnutzung und Auswirkung.
schwächen
Die CWE-Schwächeklassen, zu denen dies gehört.
betroffene Produkte (9)
Betroffene Produkte und Versionsbereiche.
Advisories (1)
Hersteller- und Ökosystem-Meldungen dazu.
- BIT-mastodon-2026-33868Mastodon has a GET-Based Open Redirect via '/web/%2F<domain>'2026-03-31vendor · osvUS
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.
auch bekannt als (3)
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quellen
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Referenzen (5)
Externe Belege — Patches, Meldungen, Analysen.
- https://access.redhat.com/security/cve/cve-2026-33868cnnvd
- https://github.com/mastodon/mastodon/releasesPatchcnnvd
- https://github.com/mastodon/mastodon/security/advisories/GHSA-xqw8-4j56-5hj6cnnvd
- https://github.com/mastodon/mastodon/security/advisories/GHSA-xqw8-4j56-5hj6enisa_euvd
- https://github.com/mastodon/mastodon/security/advisories/GHSA-xqw8-4j56-5hj6Vendor Advisorynvd
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