CVE-2026-103277
Received Received - Intake

Ghost Admin Session Hijack via Untrusted oEmbed Script Execution

Publication date: 2026-10-01

Last updated on: 2026-10-01

Assigner: VulnCheck

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.

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Meta Information

Published
2026-10-01
Last Modified
2026-10-01
Generated
2026-10-01
AI Q&A
2026-10-01
EPSS Evaluated
N/A
NVD
CVE-2026-103277
EUVD
EUVD-2026-90670

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
ghost ghost From 6.34.0 (exc) to 2.5.0 (exc)
tryghost ghost From 2.5.0 (inc) to 6.34.0 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
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.

Attack-Flow Graph

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Executive Summary

Ghost versions from 2.5.0 before 6.34.0 have an untrusted script execution vulnerability in the oEmbed preview feature. The system fails to sandbox externally hosted scripts, allowing attackers to inject malicious oEmbed content that executes in the context of a staff user's admin session, potentially compromising administrative access.

Detection Guidance

Check Ghost version with 'ghost version' command. Inspect oEmbed preview feature logs for external script execution attempts. Monitor admin session activity for unauthorized changes.

Impact Analysis

This vulnerability could allow attackers to gain administrative access to your Ghost CMS by executing malicious scripts in a staff user's session. This may lead to unauthorized changes, data theft, or further compromise of the system and its users.

Mitigation Strategies

Upgrade Ghost to version 6.34.0 or later immediately. Disable oEmbed preview feature if not required. Implement strict CSP policies to block external scripts.

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