Kyoo: OIDC login token can be redirected to an attacker-controlled URL

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-77386
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-18 18:17:14 UTC
Updated2026-09-22 16:17:54 UTC
DescriptionKyoo 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.

Risk And Classification

Primary CVSS: v3.1 6.5 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

EPSS: 0.003910000 probability, percentile 0.330360000 (date 2026-09-21)

Problem Types: CWE-601 | CWE-601 CWE-601: URL Redirection to Untrusted Site ('Open Redirect')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
3.1CNADECLARED6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Zoriya Kyoo affected < 5.1.0 Not specified

References

ReferenceSourceLinkTags
github.com/zoriya/Kyoo/pull/1576 [email protected] github.com
github.com/zoriya/Kyoo/commit/02ab3af8127a081295fd7bed103847173c0d7632 [email protected] github.com
github.com/zoriya/Kyoo/security/advisories/GHSA-xhg6-v78p-xf44 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
github.com/zoriya/Kyoo/releases/tag/v5.1.0 [email protected] github.com
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