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Critical · 10.0 Public exploit CVE-2026-31852 EUVD-2026-11242

Jellyfin Possible Organization/Secret Compromise from dangerous CI implementation

Published Mar 11, 2026 · Updated Mar 11, 2026 · Assigned by GitHub_M

Vendor: jellyfin Product: code-quality.yml

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.

Affected products

VendorProductAffectedFixed
jellyfin code-quality.yml < 109217e75f38394b2f6e46e25dfe5a721203d3c8 —

Public exploits

Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.

Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.

GitHub 1 repository

  • pvharmo2/gha-lab-3f1ff30e9c ★ 0 · Sep 4, 2026

    Authorized security-research lab reproducing CVE-2026-31852 (jellyfin/jellyfin-ios pull_request_target pwn in code-quality.yml) — isolated snapshot, not the upstream project

Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.

References