CVE-2026-95271 in changedetection.io
Summary
by MITRE • 09/22/2026
A vulnerability has been found in dgtlmoon changedetection.io up to 0.60.7. The impacted element is the function check_authentication of the file changedetectionio/flask_app.py of the component Authentication Hook. Such manipulation leads to improper authentication. The attack may be performed from remote. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
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Analysis
by VulDB Data Team • 09/22/2026
The vulnerability identified within dgtlmoon changedetection.io versions up to 0.60.7 represents a critical failure in the application's authentication logic, specifically residing in the check_authentication function located in the flask_app.py file of the Authentication Hook component. This flaw constitutes an improper authentication mechanism where the system fails to correctly verify the identity or privileges of users attempting to access protected resources. In web applications built with Flask, such hooks are typically responsible for intercepting requests before they reach specific view functions to ensure that only authorized personnel can perform certain actions. When this hook is bypassed due to a logical error in its implementation, it allows attackers to circumvent security controls entirely, effectively granting them access as if they were legitimate authenticated users without possessing valid credentials.
From an operational perspective, the impact of this vulnerability is severe because it enables remote exploitation by any actor with network connectivity to the target system. Since the exploit has been publicly disclosed and is known to be functional, automated scanning tools and malicious actors can readily leverage this flaw to gain unauthorized access. The consequences of such a breach depend heavily on the specific deployment context but generally include the ability to view sensitive monitoring data, modify detection rules, inject false positives or negatives into the change tracking logic, or potentially escalate privileges if other vulnerabilities exist within the broader application stack. For users relying on changedetection.io for security monitoring or content integrity verification, this undermines the trustworthiness of the entire system, as an attacker could manipulate what is being monitored and reported.
This type of vulnerability aligns with Common Weakness Enumeration (CWE) category CWE-287, which describes Improper Authentication, where a software product does not correctly verify that someone attempting to access a resource is who they claim to be. Furthermore, in the context of the MITRE ATT&CK framework, this flaw facilitates initial access and potentially privilege escalation tactics by allowing adversaries to bypass authentication mechanisms as part of their attack chain. The lack of response from the vendor following early notification exacerbates the risk profile for existing deployments, leaving users with no official patch or guidance on remediation through standard update channels during a period when public exploit code is available.
Mitigation strategies must therefore focus on immediate isolation and configuration hardening until an updated version is released by the maintainers. Organizations running affected versions should consider restricting network access to the changedetection.io instance using firewall rules, ensuring it is not exposed directly to untrusted networks such as the internet. If exposure is necessary for legitimate use cases, implementing a reverse proxy with additional authentication layers or IP whitelisting can provide an external control plane that compensates for the internal flaw. Additionally, administrators should audit access logs for signs of unauthorized login attempts and review any changes made to detection rules during periods when the vulnerability was active to ensure data integrity has not been compromised.