Jellyfin up to 10.11.8 Access Tab cross site scripting

CVSS Meta Temp Score
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CTI Interest Score
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4.5$0-$5k0.63

Summaryinfo

A vulnerability classified as problematic was found in Jellyfin up to 10.11.8. This issue affects some unknown processing of the component Access Tab. Such manipulation leads to cross site scripting. This vulnerability is referenced as CVE-2026-49220. It is possible to launch the attack remotely. No exploit is available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in Jellyfin up to 10.11.8. Affected by this issue is an unknown function of the component Access Tab. The manipulation with an unknown input leads to a cross site scripting vulnerability. Using CWE to declare the problem leads to CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. Impacted is integrity. CVE summarizes:

Jellyfin is an open source self hosted media server. Prior to 10.11.9, a potential XSS attack exists in Jellyfin which can allow a non-privileged user to execute arbitrary Javascript in the context of a logged-in Administrative user, resulting in numerous potential issues. The Client header during an AuthenticateByName can contain arbitrary HTML and Javascript, which will then be executed by the Administrative user when visiting the Access tab of the user in question from within the dashboard. This vulnerability is fixed in 10.11.9.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-49220 since 05/28/2026. The exploitation is known to be easy. The attack may be launched remotely. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1059.007.

Upgrading to version 10.11.9 eliminates this vulnerability.

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Productinfo

Name

Version

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.6
VulDB Meta Temp Score: 4.5

VulDB Base Score: 3.5
VulDB Temp Score: 3.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 5.7
CNA Vector (GitHub_M): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Cross site scripting
CWE: CWE-79 / CWE-94 / CWE-74
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Jellyfin 10.11.9

Timelineinfo

05/28/2026 CVE reserved
06/24/2026 +27 days Advisory disclosed
06/24/2026 +0 days VulDB entry created
06/24/2026 +0 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: GHSA-fv79-gmhx-xh2v
Status: Confirmed

CVE: CVE-2026-49220 (🔒)
GCVE (CVE): GCVE-0-2026-49220
GCVE (VulDB): GCVE-100-373520

Entryinfo

Created: 06/24/2026 21:29
Changes: 06/24/2026 21:29 (64)
Complete: 🔍
Cache ID: 216::103

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