CVE-2026-77386: Zoriya Kyoo

Medium severity, CVSS 6.5. EPSS: 0.6% chance of exploitation in the next 30 days.

Kyoo is a self-hosted media server focused on movies, series, and anime. Prior to 5.1.0, an unauthenticated attacker could initiate the OIDC login flow with an attacker-controlled redirectUrl. The login handling in auth/oidc.go stored that URL with the opaque login state, and /auth/oidc/logged/{provider} appended the provider, token, and error values before redirecting the victim's browser without validating the destination. Because the one-use token was not bound to the browser session that initiated login, an attacker who induced a victim to complete OIDC authentication could capture the token at the attacker-controlled destination and exchange it through /auth/oidc/callback/{provider} for the victim's Kyoo session. This issue is fixed in version 5.1.0.

Affected products

• Zoriya Kyoo: before 5.1.0 (fixed in 5.1.0)

Published 2026-09-18. Last modified 2026-09-24.