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CVE-2026-77386— Kyoo: OIDC login token can be redirected to an attacker-controlled URL

Quick assessment

Affected
zoriya Kyoo
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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

CVSS 6.5 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
zoriya Kyoo < 5.1.0 affected
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I. Basic Information for CVE-2026-77386

Vulnerability Information

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Vulnerability Title
Kyoo: OIDC login token can be redirected to an attacker-controlled URL
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
指向未可信站点的URL重定向(开放重定向)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
zoriya Kyoo < 5.1.0 -

II. Public POCs for CVE-2026-77386

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III. Intelligence Information for CVE-2026-77386

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Patches & Fixes for CVE-2026-77386 (2)

Other References for CVE-2026-77386 (2)

IV. Related Vulnerabilities

Same product: Kyoo
Same vendor: zoriya
Same weakness: CWE-601

V. Comments for CVE-2026-77386

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