🛡️ CVE-2026-48793

🟠 CVSS 8.8 — High ✅ No Known Exploit CWE-88 NVD
8.8
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Jellyfin is an open source self hosted media server. Prior to 10.11.10, a potential FFmpeg argument injection vulnerability exists in the subtitle conversion code path. SubtitleEncoder.ConvertTextSubtitleToSrtInternal (SubtitleEncoder.cs, line 382) interpolates the subtitle file path into FFmpeg command-line arguments without calling EncodingUtils.NormalizePath(). On Linux, filenames can contain double-quote characters, which break the argument quoting and allow injection of arbitrary FFmpeg arguments. The vulnerability is reachable without authentication via SubtitleController.GetSubtitle, which has no [Authorize] attribute. An attacker who can place a file in a Jellyfin media library directory (shared NAS, Samba share, guest upload) can achieve arbitrary file write on the server and information disclosure. This vulnerability is fixed in 10.11.10.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

Weakness class

CVE-2026-48793 is classified as CWE-88: Argument Injection. Input is passed into a command line without separating data from options, letting an attacker introduce extra arguments.

Affected software

CVE-2026-48793 is recorded against 1 package.

  • unknown

Timeline and source

Published on 24 June 2026 and last revised on 26 June 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

github.com

Details

Severity HIGH
CVSS Score 8.8
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE CWE-88
Public Exploit ✅ No
Source NVD
Published 2026-06-24
Updated 2026-08-11
Modified 2026-06-26
Fix URL N/A

Affected Packages

Software From version Fixed in
unknown — —

Similar Threats

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