Description

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in Apache Roller 6.1.5 allows a user with authoring rights on a weblog to store crafted content that is later written into the authoring UI's JavaScript string literals and markup sinks without proper encoding, causing the stored script to execute in another author's or administrator's browser. No optional feature or non-default configuration is required; this affects weblogs with multiple authors or administrators who are not mutually trusted. Users are recommended to upgrade to Apache Roller 6.1.6 or later, which moves those values out of JavaScript literals and writes them as text.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "5.4",
  "pubDate": "2026-09-28T08:16:41.913Z",
  "pubdate": "2026-09-28T08:16:41.913Z",
  "executiveSummary": "This vulnerability is classified as Improper Neutralization of Input During Web Page Generation, commonly referred to as Cross-site Scripting (XSS). It affects Apache Roller version 6.1.5.\nThe flaw allows a malicious user with authoring privileges on a weblog to inject and store crafted script content within the application.\nThis stored payload is subsequently rendered within the authoring UI’s JavaScript string literals and markup sinks without sufficient sanitization or encoding.\nWhen another author or an administrator views the compromised weblog interface, the malicious script executes within the context of their browser session.\nThis poses a significant security risk in multi-author environments where trust between administrative users and weblog contributors is not guaranteed.\nSuccessful exploitation allows attackers to perform actions on behalf of the victim, potentially leading to session hijacking, unauthorized data access, or the manipulation of administrative functions.\nNo non-default configurations or optional features are required to facilitate this attack, as the vulnerability exists within the standard authoring workflow.",
  "technicalDetails": "The vulnerability originates from the insecure handling of user-supplied data that is rendered directly into JavaScript string literals and HTML markup sinks within the Apache Roller 6.1.5 authoring UI.\nThe root cause is a failure to implement robust output encoding or neutralization mechanisms when rendering stored content. Because the application injects user-controlled input into script blocks and DOM elements, the browser interprets the injected content as executable code rather than plain text data.\nThe attack flow begins when an authenticated user possessing authoring rights submits malicious content—such as a JavaScript payload—into the weblog editor. This payload is stored persistently in the backend database. When an administrative user or another author navigates to the affected page, the application fetches the malicious payload and writes it directly into the response. Because the application fails to apply context-aware encoding, the payload breaks out of the intended JavaScript string literal or HTML attribute, triggering arbitrary script execution within the victim's session.\nAffected versions are limited to Apache Roller 6.1.5. The vulnerability requires the attacker to have legitimate authoring permissions, meaning it is an authenticated, internal threat vector. The exposure is local to the administrative and authoring interface, but the impact is severe due to the potential for privilege escalation or lateral movement if an administrator is targeted.\nPayload behavior is consistent with standard stored XSS attacks, where the malicious script may perform unauthorized operations such as exfiltrating session cookies, intercepting sensitive user inputs, or performing CSRF-based actions under the authority of the victim’s session.\nThe remediation involves shifting how data is processed within the UI. By moving stored values out of JavaScript literals and refactoring the rendering engine to output data as standard, safe text, the application effectively neutralizes the script injection vector, ensuring that characters like '<', '>', and quotes are appropriately handled by the browser's rendering engine."
}