CVE-2026-105649: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in TryGhost Ghost
Description
A cross-site scripting (XSS) vulnerability exists in TryGhost Ghost CMS versions from 4.22.0 up to but not including 6.65.0. The issue arises because SVG media thumbnails and SVG images uploaded with non-SVG file extensions were stored without proper sanitization. This flaw allows any staff user, including Contributors, to host malicious scripts on the site's domain, potentially compromising other staff users' admin sessions. The vulnerability is fixed in version 6.65.0.
CVSS v3.1
Score 7.3high
Affected software
TryGhost
Ghost
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
TryGhost Ghost CMS versions >=4.22.0 and <6.65.0 improperly neutralize input during web page generation by storing SVG media thumbnails and SVG images uploaded with non-SVG file extensions without sanitization. This cross-site scripting (CWE-79) vulnerability enables any staff user, including Contributors, to host scripts on the site's domain, which may lead to compromise of other staff users' administrative sessions. The issue is resolved in version 6.65.0.
Potential Impact
Successful exploitation allows an attacker with staff-level access, including Contributors, to inject malicious scripts that run in the context of the site's domain. This can lead to compromise of other staff users' admin sessions, resulting in unauthorized administrative actions. The vulnerability does not affect availability but impacts confidentiality and integrity.
Mitigation Recommendations
Upgrade to TryGhost Ghost version 6.65.0 or later, where this vulnerability is fixed. No other mitigation or workaround is indicated in the available data.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-10-05T16:40:39.613Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ac3f82f2cdf04f6563003dc
Added to database: 10/05/2026, 19:19:11 UTC
Last enriched: 10/05/2026, 19:33:28 UTC
Last updated: 10/05/2026, 19:34:03 UTC
Views: 7
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