CVE-2026-104411: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in TryGhost Ghost
Ghost from 6.22.1 before 6.64.0 contains a stored cross-site scripting vulnerability that allows staff users to host scripts by uploading files served with extension-derived content types on the default local storage adapter. Attackers can upload script-bearing files to the site's domain to compromise other staff users' admin sessions.
AI Analysis
Technical Summary
CVE-2026-104411 is a stored cross-site scripting vulnerability in TryGhost Ghost versions >=6.22.1 and <6.64.0. The vulnerability arises because staff users can upload files that are served with content types derived from their file extensions without proper input neutralization during web page generation. This enables attackers to host malicious scripts on the site domain, which can execute in the browsers of other staff users, compromising their admin sessions.
Potential Impact
Successful exploitation allows an attacker with staff user privileges to upload malicious script-bearing files that execute in the context of other staff users' admin sessions. This can lead to session compromise and unauthorized actions within the admin interface. The vulnerability has a high severity with a CVSS 4.0 score of 8.5, indicating significant risk if exploited.
Mitigation Recommendations
A fix is available in Ghost version 6.64.0 and later. Users should upgrade to version 6.64.0 or newer to remediate this vulnerability. No other mitigations are specified in the provided data.
CVE-2026-104411: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in TryGhost Ghost
Description
Ghost from 6.22.1 before 6.64.0 contains a stored cross-site scripting vulnerability that allows staff users to host scripts by uploading files served with extension-derived content types on the default local storage adapter. Attackers can upload script-bearing files to the site's domain to compromise other staff users' admin sessions.
CVSS v4.0
Score 8.5high
Affected software
TryGhost
Ghost
pkg:github/tryghost/GhostRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-104411 is a stored cross-site scripting vulnerability in TryGhost Ghost versions >=6.22.1 and <6.64.0. The vulnerability arises because staff users can upload files that are served with content types derived from their file extensions without proper input neutralization during web page generation. This enables attackers to host malicious scripts on the site domain, which can execute in the browsers of other staff users, compromising their admin sessions.
Potential Impact
Successful exploitation allows an attacker with staff user privileges to upload malicious script-bearing files that execute in the context of other staff users' admin sessions. This can lead to session compromise and unauthorized actions within the admin interface. The vulnerability has a high severity with a CVSS 4.0 score of 8.5, indicating significant risk if exploited.
Mitigation Recommendations
A fix is available in Ghost version 6.64.0 and later. Users should upgrade to version 6.64.0 or newer to remediate this vulnerability. No other mitigations are specified in the provided data.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-10-02T00:44:44.528Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6abf99ada43b0b3b89b26745
Added to database: 10/02/2026, 11:46:53 UTC
Last enriched: 10/02/2026, 12:18:06 UTC
Last updated: 10/02/2026, 21:28:56 UTC
Views: 5
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