CVE-2026-104413: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in TryGhost Ghost
Ghost from 5.94.0 before 6.64.0 contains a stored cross-site scripting vulnerability that allows staff users, including Contributors, to host arbitrary HTML by abusing bookmark card image fetching. Attackers can create bookmark cards that store non-image files from external websites as icons or thumbnails to compromise other staff users' admin sessions.
AI Analysis
Technical Summary
CVE-2026-104413 is a stored cross-site scripting vulnerability in the Ghost blogging platform versions >=5.94.0 and <6.64.0. The vulnerability arises from improper neutralization of input during web page generation, specifically through the bookmark card image fetching mechanism. Staff users with Contributor privileges can abuse this feature to host arbitrary HTML content by referencing non-image external files as bookmark card icons or thumbnails. This can lead to compromise of other staff users' administrative sessions.
Potential Impact
Successful exploitation allows an attacker with staff-level access to inject malicious HTML that can execute in the context of other staff users' browsers. This can lead to session compromise of administrative users, potentially allowing unauthorized actions within the Ghost admin interface.
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 additional mitigation steps are indicated.
CVE-2026-104413: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in TryGhost Ghost
Description
Ghost from 5.94.0 before 6.64.0 contains a stored cross-site scripting vulnerability that allows staff users, including Contributors, to host arbitrary HTML by abusing bookmark card image fetching. Attackers can create bookmark cards that store non-image files from external websites as icons or thumbnails 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-2026-104413 is a stored cross-site scripting vulnerability in the Ghost blogging platform versions >=5.94.0 and <6.64.0. The vulnerability arises from improper neutralization of input during web page generation, specifically through the bookmark card image fetching mechanism. Staff users with Contributor privileges can abuse this feature to host arbitrary HTML content by referencing non-image external files as bookmark card icons or thumbnails. This can lead to compromise of other staff users' administrative sessions.
Potential Impact
Successful exploitation allows an attacker with staff-level access to inject malicious HTML that can execute in the context of other staff users' browsers. This can lead to session compromise of administrative users, potentially allowing unauthorized actions within the Ghost admin interface.
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 additional mitigation steps are indicated.
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: 6abf99ada43b0b3b89b26747
Added to database: 10/02/2026, 11:46:53 UTC
Last enriched: 10/02/2026, 12:17:58 UTC
Last updated: 10/02/2026, 21:28:56 UTC
Views: 6
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.