apostrophecms apostrophe 4.29.0 cross site scripting

Summaryinfo

A vulnerability was found in apostrophecms apostrophe 4.29.0. It has been rated as problematic. Affected by this issue is some unknown functionality. The manipulation leads to cross site scripting. This vulnerability is documented as CVE-2026-45011. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in apostrophecms apostrophe 4.29.0. This issue affects an unknown function. 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. The summary by CVE is:

ApostropheCMS is an open-source Node.js content management system. Version 4.29.0 has a stored cross-site scripting vulnerability in the image widget functionality. A user with the Editor role can configure an image widget link to use a javascript: URL payload. Because editors have permission to publish pages, the malicious widget can be published to the live site. When another user, including an administrator or public visitor, clicks the affected image/link, arbitrary JavaScript executes in the victim’s browser. As of time of publication, no known patched versions are available.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-45011 since 05/08/2026. The exploitation is known to be easy. The attack may be initiated remotely. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1059.007 according to MITRE ATT&CK.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• apostrophecms

Name

• apostrophe

Version

• 4.29.0

Website

• Product: https://github.com/apostrophecms/apostrophe/

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