{"id":"CVE-2026-77386","title":"Kyoo is a self-hosted media server focused on movies, series, and anime","summary":"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 th…","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N","cwe":["CWE-601"],"vendor":"zoriya","product":"Kyoo","affected":["Kyoo < 5.1.0"],"published":"2026-09-18","updated":"2026-09-24","sourceUpdated":"2026-09-24T21:25:27.050","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-77386","references":[{"url":"https://github.com/zoriya/Kyoo/commit/02ab3af8127a081295fd7bed103847173c0d7632","label":"security-advisories@github.com"},{"url":"https://github.com/zoriya/Kyoo/pull/1576","label":"security-advisories@github.com"},{"url":"https://github.com/zoriya/Kyoo/releases/tag/v5.1.0","label":"security-advisories@github.com"},{"url":"https://github.com/zoriya/Kyoo/security/advisories/GHSA-xhg6-v78p-xf44","label":"security-advisories@github.com"},{"url":"https://github.com/zoriya/Kyoo/security/advisories/GHSA-xhg6-v78p-xf44","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd","cve.org","exploit-available"],"epss":0.00559,"epssPercentile":0.46342,"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-22T15:08:48.131175Z"},"ingestedAt":"2026-09-18T17:46:41.549Z","slug":"CVE-2026-77386","body":"## Overview\n\nKyoo 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":209171,"id":"CVE-2026-77386","ts":1790093218328,"field":"exploit_available","old":"false","new":"true"}]}