CVE-2026-77386: CWE-601: URL Redirection to Untrusted Site ('Open Redirect') in zoriya Kyoo
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.
AI Analysis
Technical Summary
CVE-2026-77386 describes an open redirect vulnerability (CWE-601) in Kyoo, a self-hosted media server. Before version 5.1.0, the OIDC login flow allowed an unauthenticated attacker to specify a redirectUrl parameter that was stored with the login state and later used in a redirect without validation. Because the one-use token was not bound to the initiating browser session, an attacker could trick a victim into completing authentication and capture the token at an attacker-controlled URL. The attacker could then exchange this token to gain unauthorized access to the victim's Kyoo session. This vulnerability is fixed in Kyoo version 5.1.0.
Potential Impact
Successful exploitation allows an attacker to hijack a victim's Kyoo session by capturing a one-use token through an open redirect in the OIDC login flow. This compromises confidentiality by enabling unauthorized access to the victim's authenticated session. There is no impact on integrity or availability reported.
Mitigation Recommendations
Upgrade Kyoo to version 5.1.0 or later, where this vulnerability is fixed. No other mitigation is indicated or required.
CVE-2026-77386: CWE-601: URL Redirection to Untrusted Site ('Open Redirect') in zoriya Kyoo
Description
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.
CVSS v3.1
Score 6.5medium
Affected software
zoriya
Kyoo
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-77386 describes an open redirect vulnerability (CWE-601) in Kyoo, a self-hosted media server. Before version 5.1.0, the OIDC login flow allowed an unauthenticated attacker to specify a redirectUrl parameter that was stored with the login state and later used in a redirect without validation. Because the one-use token was not bound to the initiating browser session, an attacker could trick a victim into completing authentication and capture the token at an attacker-controlled URL. The attacker could then exchange this token to gain unauthorized access to the victim's Kyoo session. This vulnerability is fixed in Kyoo version 5.1.0.
Potential Impact
Successful exploitation allows an attacker to hijack a victim's Kyoo session by capturing a one-use token through an open redirect in the OIDC login flow. This compromises confidentiality by enabling unauthorized access to the victim's authenticated session. There is no impact on integrity or availability reported.
Mitigation Recommendations
Upgrade Kyoo to version 5.1.0 or later, where this vulnerability is fixed. No other mitigation is indicated or required.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-08-20T19:36:13.806Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6aad759f55bf5e2cf54f35d3
Added to database: 09/18/2026, 17:32:15 UTC
Last enriched: 09/18/2026, 17:47:05 UTC
Last updated: 09/19/2026, 01:59:49 UTC
Views: 10
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