{"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":"2026-09-18","sourceUpdated":"2026-09-18T18:17:14.513","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"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-18T17:46:41.549Z","epss":0.00391,"epssPercentile":0.33036,"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":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}