CVE-2026-31852
CRITICALCVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
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2Tags
Description
Jellyfin is an open-source media system. The code-quality.yml GitHub Actions workflow in jellyfin/jellyfin-ios is vulnerable to arbitrary code execution via pull requests from forked repositories. Due to the workflow's elevated permissions (nearly all write permissions), this vulnerability enables full repository takeover of jellyfin/jellyfin-ios, exfiltration of highly privileged secrets, Apple App Store supply chain attack, GitHub Container Registry (ghcr.io) package poisoning, and full jellyfin organization compromise via cross-repository token usage. Note: This is not a code vulnerability, but a vulnerability in the GitHub Actions workflows. No new version is required for this GHSA and end users do not need to take any actions.
Analysis
Arbitrary code execution in Jellyfin iOS GitHub Actions workflow. CVSS 10.0.
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Remediation
Within 24 hours: Immediately disable or restrict the code-quality.yml workflow to prevent execution on pull requests from forks; review recent pull requests and build artifacts for suspicious activity. Within 7 days: Implement mandatory code review and approval processes for all workflow modifications; audit GitHub Actions permissions and consider using GITHUB_TOKEN with read-only access for fork PRs. …
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