CVE-2026-24778: Ghost vulnerable to XSS via malicious Portal preview links
Impact An attacker was able to craft a malicious link that, when accessed by an authenticated staff user or member, would execute JavaScript with the victim's permissions, potentially leading to account takeover.
Vulnerable versions This vulnerability is present in Ghost versions: - v5.43.0 to v5.120.4 - v6.0.0 to v6.14.0
As well as in Portal versions: - v2.29.1 to v2.51.4 - v2.52.0 to v2.57.0
Patches Ghost automatically loads the latest patch of the members Portal component via CDN. Therefore: - For Ghost 5.x users, upgrading to v5.121.0 or later fixes the vulnerability (loads Portal v2.51.5, which contains the patch) - For Ghost 6.x users, upgrading to v6.15.0 or later fixes the vulnerability (loads Portal v2.57.1, which contains the patch)
For Ghost installations using a customised or self-hosted version of Portal, it will be necessary to manually rebuild from or update to the latest patch version.
References Ghost thanks Younes Belalia for discovering and disclosing this vulnerability responsibly.
For more information If users have any questions or comments about this advisory, email Ghost at security@ghost.org.
Other sources
Ghost is an open source content management system. In Ghost versions 5.43.0 through 5.12.04 and 6.0.0 through 6.14.0, an attacker was able to craft a malicious link that, when accessed by an authenticated staff user or member, would execute JavaScript with the victim's permissions, potentially leading to account takeover. Ghost Portal versions 2.29.1 through 2.51.4 and 2.52.0 through 2.57.0 were vulnerable to this issue. Ghost automatically loads the latest patch of the members Portal component via CDN. For Ghost 5.x users, upgrading to v5.121.0 or later fixes the vulnerability. v5.121.0 loads Portal v2.51.5, which contains the patch. For Ghost 6.x users, upgrading to v6.15.0 or later fixes the vulnerability. v6.15.0 loads Portal v2.57.1, which contains the patch. For Ghost installations using a customized or self-hosted version of Portal, it will be necessary to manually rebuild from or update to the latest patch version.
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Affected Software
Remediation
Event History
Frequently Asked Questions
What is the severity of CVE-2026-24778?
CVE-2026-24778 is classified as a high-severity vulnerability due to its potential for Cross-Site Scripting (XSS) attacks.
How do I fix CVE-2026-24778?
To fix CVE-2026-24778, you should upgrade Ghost to version 5.44.0 or later and 6.15.0 or later.
Which versions of Ghost are affected by CVE-2026-24778?
CVE-2026-24778 affects Ghost versions 5.12.04 to 5.43.0 and 6.0.0 to 6.14.0.
Can CVE-2026-24778 affect authenticated users?
Yes, CVE-2026-24778 can affect authenticated staff users or members accessing malicious Portal preview links.
What type of attack does CVE-2026-24778 involve?
CVE-2026-24778 involves a Cross-Site Scripting (XSS) attack via malicious links.