Jellyfin
CVE-2026-31852
CRITICAL
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain
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AccessFork jellyfin/jellyfin-ios repository
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ExploitSubmit pull request with malicious code
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ExecutionGitHub Actions workflow executes with elevated permissions
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ImpactExfiltrate secrets and compromise organization
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A06:2025 - Insecure Design
ASVS 5.0
V8 - Authorization Least privilege enforcement
MITRE ATT&CK
1 technique across 1 tactic: Privilege Escalation The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Exploitation Conditions | Pull requests from forked repositories must trigger the code-quality.yml GitHub Actions workflow with write permissions enabled. Attacker needs ability to create pull requests against jellyfin/jellyfin-ios; no authentication or special configuration required beyond default GitHub repository fork settings. |
| Impact | CVSS 10.0. |
| Exploit ScenarioDerived | PR-based code execution with repo secrets. |
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Alert meAnalysisAIv1 – Mar 12, 2026
Arbitrary code execution in Jellyfin iOS GitHub Actions workflow. CVSS 10.0.
Earlier versions of this analysis (1)
CI/CD supply chain attack in Jellyfin iOS.
RemediationAI
Fix Actions workflow.
Affects your stack
Find out whether the stacks and servers you run are on an affected version.
Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
CWE-269 in GitHub Actions.
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- Exploit and PoC references, threat intelligence from 22 sources
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Severity by source
AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
DescriptionGitHub Advisory
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.
Executive ViewAI
A critical vulnerability in the Jellyfin iOS GitHub Actions workflow allows attackers to execute arbitrary code through pull requests from forked repositories, potentially compromising the integrity of the iOS application and any systems relying on it. Organizations using Jellyfin iOS are at immediate risk of supply chain attacks that could lead to malicious code injection into releases.
Disable GitHub Actions workflow execution for pull requests originating from forked repositories; implement branch protection rules requiring manual approval before workflow runs; restrict repository secrets and deploy tokens from being accessible in fork-based workflows; use GitHub's environment protection features to gate sensitive build steps; consider moving to a separate, isolated CI/CD environment for release builds with stricter access controls; conduct immediate code and artifact review for all recent builds.
Threat Intelligence Overview
NVD
CVE.org
EPSS
GitHub
VulDB
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Privilege escalation occurs when an attacker leverages flaws in access control mechanisms to gain permissions beyond what they were originally granted.
Remote Code Execution represents the critical moment when an attacker successfully runs arbitrary code on a target system without physical access.
Affected Products (CPE)GitHub Advisory
Jellyfin is a Free Software Media System for managing and streaming media. Rated high severity (CVSS 8.8), this vulnerab
In Jellyfin before 10.8, the /users endpoint has incorrect access control for admin functionality. Rated high severity (
Jellyfin is a free-software media system. Rated high severity (CVSS 8.1), this vulnerability is remotely exploitable, lo
Jellyfin up to v10.7.7 was discovered to contain a Server-Side Request Forgery (SSRF) via the component /Repositories. R
Jellyfin is a system for managing and streaming media. Rated high severity (CVSS 7.2), this vulnerability is remotely ex
Jellyfin is a Free Software Media System. Rated medium severity (CVSS 6.5), this vulnerability is remotely exploitable,
Jellyfin is a free software media system that provides media from a dedicated server to end-user devices via multiple ap
jellyfin-web is the web client for Jellyfin, a free-software media system. Rated medium severity (CVSS 5.4), this vulner
In Jellyfin 10.8.x through 10.8.3, the name of a playlist is vulnerable to stored XSS. Rated medium severity (CVSS 5.4),
In Jellyfin 10.8.x through 10.8.3, the name of a collection is vulnerable to stored XSS. Rated medium severity (CVSS 5.4
In Jellyfin before 10.8, stored XSS allows theft of an admin access token. Rated medium severity (CVSS 5.4), this vulner
Arbitrary file read via ffmpeg argument injection in Jellyfin media server versions before 10.11.7 allows unauthenticate
Exploit-DB