What’s Vulnerable › Vulnerabilities

CVE-2021-21402: Unauthenticated Arbitrary File Access in Jellyfin

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 79.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-03-23 · updated 2026-06-17
• Weakness: CWE-22

Description

Jellyfin is a Free Software Media System. In Jellyfin before version 10.7.1, with certain endpoints, well crafted requests will allow arbitrary file read from a Jellyfin server's file system. This issue is more prevalent when Windows is used as the host OS. Servers that are exposed to the public Internet are potentially at risk. This is fixed in version 10.7.1. As a workaround, users may be able to restrict some access by enforcing strict security permissions on their filesystem, however, it is recommended to update as soon as possible.

Affected products

• jellyfin: before 10.7.1 — fixed in 10.7.1

How to fix

Upgrade to a fixed version: jellyfin 10.7.1. Check the vendor advisory for mitigations.

References

• https://github.com/jellyfin/jellyfin/commit/0183ef8e89195f420c48d2600bc0b72f6d3a7fd7
• https://github.com/jellyfin/jellyfin/releases/tag/v10.7.1
• https://github.com/jellyfin/jellyfin/security/advisories/GHSA-wg4c-c9g9-rxhx
• https://github.com/jellyfin/jellyfin/commit/0183ef8e89195f420c48d2600bc0b72f6d3a7fd7
• https://github.com/jellyfin/jellyfin/releases/tag/v10.7.1
• https://github.com/jellyfin/jellyfin/security/advisories/GHSA-wg4c-c9g9-rxhx

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