CVE-2026-103277: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in TryGhost Ghost
Ghost versions from 2.5.0 before 6.34.0 contain an untrusted script execution vulnerability in the oEmbed preview feature that fails to sandbox externally hosted scripts. Attackers can craft malicious oEmbed content to execute scripts in the context of a staff user's admin session, potentially compromising administrative access.
AI Analysis
Technical Summary
CVE-2026-103277 is a cross-site scripting vulnerability affecting the Ghost blogging platform. The issue exists in versions >=2.5.0 and <6.34.0 within the oEmbed preview feature, which fails to properly sandbox externally hosted scripts. Attackers can craft malicious oEmbed content that executes scripts in the context of an administrative user, risking unauthorized administrative access.
Potential Impact
Successful exploitation can lead to execution of arbitrary scripts in the admin session context, potentially allowing attackers to compromise administrative accounts and perform unauthorized actions within the Ghost platform. This elevates the risk to high due to the administrative privileges involved.
Mitigation Recommendations
A fix is available in Ghost version 6.34.0 and later. Users should upgrade to version 6.34.0 or newer to remediate this vulnerability. No additional mitigation steps are indicated in the provided data.
CVE-2026-103277: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in TryGhost Ghost
Description
Ghost versions from 2.5.0 before 6.34.0 contain an untrusted script execution vulnerability in the oEmbed preview feature that fails to sandbox externally hosted scripts. Attackers can craft malicious oEmbed content to execute scripts in the context of a staff user's admin session, potentially compromising administrative access.
CVSS v4.0
Score 8.6high
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-2026-103277 is a cross-site scripting vulnerability affecting the Ghost blogging platform. The issue exists in versions >=2.5.0 and <6.34.0 within the oEmbed preview feature, which fails to properly sandbox externally hosted scripts. Attackers can craft malicious oEmbed content that executes scripts in the context of an administrative user, risking unauthorized administrative access.
Potential Impact
Successful exploitation can lead to execution of arbitrary scripts in the admin session context, potentially allowing attackers to compromise administrative accounts and perform unauthorized actions within the Ghost platform. This elevates the risk to high due to the administrative privileges involved.
Mitigation Recommendations
A fix is available in Ghost version 6.34.0 and later. Users should upgrade to version 6.34.0 or newer to remediate this vulnerability. No additional mitigation steps are indicated in the provided data.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-09-30T10:59:00.638Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6abe7486a43b0b3b89bd1c4a
Added to database: 10/01/2026, 14:56:06 UTC
Last enriched: 10/01/2026, 15:15:45 UTC
Last updated: 10/01/2026, 22:26:13 UTC
Views: 3
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