CVE-2026-54717 in Silverstripe
Summary
by MITRE • 08/07/2026
Silverstripe CMS is an open source content management system. Prior to 6.2.1, page breadcrumbs in the CMS are vulnerable to cross-site scripting when viewed using the page list view, because page titles are rendered into the breadcrumb trail without being escaped. This issue is fixed in 6.2.1.
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Analysis
by VulDB Data Team • 08/07/2026
Silverstripe CMS versions prior to 6.2.1 contain a critical cross-site scripting vulnerability within the administrative interface that affects the page list view functionality. The vulnerability stems from improper input sanitization when rendering page titles into breadcrumb navigation elements, creating an exploitable vector for malicious code execution. This flaw exists specifically in the CMS's backend interface where administrators navigate through pages using the page list view, making it particularly dangerous for users with administrative privileges who frequently interact with this component.
The technical implementation of this vulnerability occurs when the system processes page titles that contain malicious script payloads within their content. During rendering of the breadcrumb trail, these titles are directly inserted into HTML output without proper HTML entity encoding or sanitization procedures. This allows attackers to inject malicious JavaScript code that executes in the context of the administrator's browser session, potentially enabling complete compromise of the CMS instance.
The operational impact of this vulnerability extends beyond simple XSS exploitation as it provides attackers with the ability to establish persistent access to the content management system. An attacker who gains access to an administrator account through this vulnerability could modify or delete content, install malicious plugins, manipulate user permissions, or even exfiltrate sensitive data from the CMS database. The attack surface is particularly concerning because administrators regularly use the page list view functionality, making this vector highly accessible for exploitation.
This vulnerability aligns with CWE-79 which specifically addresses cross-site scripting flaws in web applications, and represents a classic case of insufficient output escaping or encoding. From an ATT&CK framework perspective, this issue enables initial access and privilege escalation through the use of web application vulnerabilities, potentially leading to persistent access via credential compromise or session hijacking. The exploitation requires minimal privileges and can be automated, making it particularly attractive to threat actors targeting content management systems.
Organizations using Silverstripe CMS versions prior to 6.2.1 should immediately implement the available patch as the primary mitigation strategy. The fix involves implementing proper HTML escaping for page titles within breadcrumb rendering processes, ensuring that all user-provided content is sanitized before being rendered in the administrative interface. Additional protective measures include implementing content security policies, conducting regular security audits of CMS components, and monitoring for suspicious activity in administrator sessions, particularly around page listing and navigation functions.