baserproject BaserCMS up to 5.3.1/5.4.1 Shortcode Processing BcBaser.getGoogleMaps cross site scripting

Summaryinfo

A vulnerability was found in baserproject BaserCMS up to 5.3.1/5.4.1 and classified as problematic. Affected by this issue is the function BcBaser.getGoogleMaps of the component Shortcode Processing. Such manipulation leads to cross site scripting. This vulnerability is traded as CVE-2026-115457. The attack may be launched remotely. There is no exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in baserproject BaserCMS up to 5.3.1/5.4.1. Affected by this issue is the function BcBaser.getGoogleMaps of the component Shortcode Processing. 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:

baserCMS is a website development framework. In versions 5.0.0 before 5.3.2 and 5.4.0 before 5.4.2, global shortcode expansion runs over the complete rendered page, including HTML-escaped blog comments supplied by unauthenticated visitors. A comment containing the BcBaser.getGoogleMaps shortcode can set apiBaseUrl to an attacker-controlled script URL, which is emitted as a script src and executes JavaScript on the site's origin when another visitor or administrator opens the article displaying that comment. Escaping raw HTML in comments does not prevent this stored cross-site scripting because shortcode processing happens after HTML rendering. Other registered shortcodes also expand in comments; Mail.getForm can embed a working contact form with a valid CSRF token. The flaw can compromise the authenticated browser context of an administrator who views the affected article. This issue has been patched in versions 5.3.2 and 5.4.2.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-115457 since 10/22/2026. 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. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1059.007 by the MITRE ATT&CK project.

Upgrading to version 5.3.2 or 5.4.2 eliminates this vulnerability.

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Productinfo

Type

• Content Management System

Vendor

• baserproject

Name

• BaserCMS

Version

• 5.3.0
• 5.3.1
• 5.4.0
• 5.4.1

License

• open-source

Website

• Product: https://github.com/baserproject/basercms/

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