Privilege escalation in Jellyfin Code-Quality.yml
CVE-2026-31852
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.
Vulnerability class: Privilege Escalation
EPSS: 0.004 (36.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.
Affected products
- Jellyfin Code-quality.yml — versions < 109217e75f38394b2f6e46e25dfe5a721203d3c8
- Jellyfin
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
- security-advisories@github.com (Patch, x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-31852?
- CVE-2026-31852 is a critical-severity vulnerability in Jellyfin Code-Quality.yml, classified under Improper Privilege Management. CVSS score: 10.0/10. Published 2026-03-11.
- How severe is CVE-2026-31852?
- Critical severity. CVSS v3 base score is 10.0 out of 10.