CVE-2023-49096Public exploitNetwork attack vector

Arbitrary file access via FFmpeg argument injection

Published Dec 6, 2023 · Updated May 28, 2025

Argument injection in Jellyfin before 10.8.13 allows remote attackers to read or write host files through video-stream requests. VideosController passes unvalidated videoCodec and audioCodec query values into a single FFmpeg argument string, allowing extra flags to be appended. The endpoints require no authentication, but exploitation requires a valid random media item GUID; code execution additionally requires plugin loading and a server restart.

CVSS severity7.7
High
EPSS probability1.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Argument injection in Jellyfin before 10.8.13 allows remote attackers to read or write host files through video-stream requests. VideosController passes unvalidated videoCodec and audioCodec query values into a single FFmpeg argument string, allowing extra flags to be appended. The endpoints require no authentication, but exploitation requires a valid random media item GUID; code execution additionally requires plugin loading and a server restart.

The record

CVE
CVE-2023-49096
Published
Dec 6, 2023
Updated
May 28, 2025
Vendor
Jellyfin
Product
Jellyfin
Classifications
CWE-88, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 6, 2023CVE publishedPublication date reported by the CVE source.
  2. May 28, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 10.8.13

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Jellyfin · Jellyfinversion=< 10.8.13

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.7GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-88Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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