CVE-2026-92814 in changedetection.io
Summary
by MITRE • 09/16/2026
changedetection.io through 0.60.6 fails to escape the scraped page title in HTML notifications, allowing arbitrary markup injection. Attackers can place malicious markup in monitored page titles that reaches notification channels like email and Telegram as live content when the watch_title token is used in templates.
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Analysis
by VulDB Data Team • 09/16/2026
The vulnerability identified in changedetection.io versions through 0.60.6 represents a significant Cross-Site Scripting (XSS) risk stemming from insufficient input validation and output encoding within the application's notification system. This flaw specifically affects the handling of scraped page titles when they are rendered into HTML-based notifications. The core technical issue lies in the failure to properly escape special characters present in the monitored web page title before it is inserted into the email or messaging platform templates. When an administrator configures a watch using the watch_title token, the system directly incorporates the raw text of that title into the notification payload without applying necessary HTML entity encoding or sanitization procedures. This oversight allows any malicious markup embedded within the target webpage's title to pass through the scraping process and appear as executable content in the final notification message.
From an operational perspective, this vulnerability enables attackers who control a monitored web page to execute arbitrary scripts in the context of users receiving these notifications. If the monitoring service is accessed via HTTPS but the email client or Telegram interface renders HTML without strict sandboxing, injected JavaScript can access session cookies, local storage, or perform actions on behalf of the user viewing the notification. This constitutes an injection flaw where untrusted data serves as input to a web application that does not validate or encode it before inclusion in output. The impact is particularly severe because notifications are often viewed by administrators who may have elevated privileges within the changedetection.io instance, potentially leading to account takeover or further lateral movement if session tokens are exfiltrated.
This vulnerability aligns with Common Weakness Enumeration (CWE) category CWE-79: Improper Neutralization of Input During Web Page Generation, commonly known as Cross-Site Scripting. Specifically, it falls under the sub-category of Stored XSS if the malicious title is saved and later rendered, or Reflected XSS depending on how the notification pipeline processes the data in real-time. In terms of the MITRE ATT&CK framework, this behavior maps to T1059: Command and Control Scripting, as attackers can use injected scripts for beaconing or command execution, and potentially T1213: Data from Information Repositories if sensitive information is harvested via the compromised notification channel. The attack vector relies on social engineering elements where an attacker manipulates a public web page to target specific monitors, making detection difficult without strict content security policies in place at both the application level and the client viewing the notifications.
Mitigation strategies must focus on implementing robust output encoding mechanisms within the changedetection.io codebase. Developers should ensure that all dynamic data inserted into HTML contexts is encoded using standard libraries such as OWASP Java Encoder or equivalent Python-based sanitizers like Bleach, which convert special characters to their corresponding HTML entities before rendering. Additionally, implementing a Content Security Policy (CSP) header in any web interface associated with the notifications can restrict script execution even if injection occurs. For users currently running affected versions, immediate steps include upgrading to version 0.61 or later where this issue has been addressed. In the interim, administrators should avoid using the watch_title token in HTML templates and instead use plain text notification formats until a patch is deployed. Regular security audits of template rendering logic are recommended to prevent similar injection flaws across other notification channels such as Slack, Discord, or custom webhook integrations that may share the same underlying data handling architecture.