Description

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in Apache Roller 6.1.5 allows a remote attacker to perform reflected cross-site scripting against a visitor to a weblog using the bundled frontpage theme, by supplying a crafted blog-directory parameter that the directory page reflects without proper escaping. This affects only weblogs that use the bundled frontpage theme, and a victim must follow a crafted link for the script to execute. Users are recommended to upgrade to Apache Roller 6.1.6 or later, which validates and contextually escapes the reflected parameter.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "6.1",
  "pubDate": "2026-09-28T08:16:42.037Z",
  "pubdate": "2026-09-28T08:16:42.037Z",
  "executiveSummary": "Apache Roller 6.1.5 contains an Improper Neutralization of Input During Web Page Generation vulnerability, classified as reflected Cross-site Scripting (XSS).\nThe vulnerability resides in the handling of the blog-directory parameter when utilizing the bundled frontpage theme.\nA remote, unauthenticated attacker can exploit this flaw by crafting a malicious URL containing a JavaScript payload, which is then reflected by the application without proper sanitization or encoding.\nSuccessful exploitation requires the victim to interact with the crafted link, leading to the execution of arbitrary scripts within the user's browser session in the context of the affected weblog.\nThis can result in unauthorized actions on behalf of the user, session hijacking, or the exfiltration of sensitive information.\nThe risk is limited to weblogs specifically configured to use the vulnerable bundled frontpage theme.\nThe vendor has addressed this issue in Apache Roller 6.1.6 by implementing comprehensive input validation and contextual output escaping.",
  "technicalDetails": "The vulnerability is caused by a failure to perform adequate input sanitization and output encoding on the blog-directory parameter in the directory page of the bundled frontpage theme in Apache Roller 6.1.5.\nIn a reflected XSS attack scenario, the application accepts user-supplied data via the HTTP GET request parameter and renders it directly into the HTML response body without contextual escaping.\nThe root cause is the reliance on unsanitized user input in the rendering process, which allows an attacker to break out of the intended HTML element context and inject arbitrary script tags or event handlers into the page document object model (DOM).\nTo initiate the attack, an adversary constructs a malicious URL that includes a payload within the blog-directory query string parameter. This payload typically consists of JavaScript or HTML tags formatted to bypass basic filters if any exist.\nThe attacker then lures a victim to visit this crafted link. When the victim's browser requests the resource, the Apache Roller server generates a response containing the unsanitized payload.\nThe browser, interpreting the server's response, treats the reflected payload as executable code rather than plain text, thereby executing the script within the origin of the vulnerable weblog.\nBecause the script runs in the context of the victim's browser, it gains access to sensitive data such as cookies, session tokens, and localStorage associated with the domain.\nThe impact includes the potential for session hijacking, unauthorized content modification, or the redirection of users to malicious third-party websites.\nThe attack is characterized as remote and does not require prior authentication or elevated privileges, as the execution occurs client-side after the server processes the tainted parameter.\nThe vulnerability is strictly scoped to deployments utilizing the bundled frontpage theme, suggesting that the logic error is localized to the specific templates or rendering components associated with that theme.\nPost-exploitation, the attacker can leverage the victim's authenticated session to perform actions on the platform or capture data displayed on the page, effectively bypassing the security boundary between the user and the web application."
}