TryGhost Portal cross site scripting

Summaryinfo

A vulnerability categorized as problematic has been discovered in TryGhost Ghost. This vulnerability affects unknown code of the component Portal. Such manipulation leads to cross site scripting. This vulnerability is listed as CVE-2026-24778. The attack may be performed from remote. There is no available exploit. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in TryGhost Ghost (affected version unknown) and classified as problematic. Affected by this issue is an unknown functionality of the component Portal. The manipulation with an unknown input leads to a cross site scripting vulnerability. Using CWE to declare the problem leads to 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. Impacted is integrity. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-24778 since 01/26/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1059.007.

Upgrading eliminates this vulnerability. Applying the patch da858e640e88e69c1773a7b7ecdc2008fa143849 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-4713). Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

• TryGhost

Name

• Ghost

License

• open-source

Website

• Product: https://github.com/TryGhost/Ghost/

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Once again VulDB remains the best source for vulnerability data.

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