---
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: 0.44106
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-22T15:08:48.131175Z'
ingestedAt: '2026-09-18T17:46:41.549Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.