dgtlmoon changedetection.io up to 0.54.7 blueprint.route authorization

Summaryinfo

A vulnerability was found in dgtlmoon changedetection.io up to 0.54.7. It has been classified as critical. This vulnerability affects the function blueprint.route. The manipulation leads to authorization. This vulnerability is uniquely identified as CVE-2026-35490. The attack is possible to be carried out remotely. No exploit exists. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in dgtlmoon changedetection.io up to 0.54.7. It has been rated as critical. This issue affects the function blueprint.route. The manipulation with an unknown input leads to a authorization vulnerability. Using CWE to declare the problem leads to CWE-863. The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. This allows attackers to bypass intended access restrictions. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

changedetection.io is a free open source web page change detection tool. Prior to 0.54.8, the @login_optionally_required decorator is placed before (outer to) @blueprint.route() instead of after it. In Flask, @route() must be the outermost decorator because it registers the function it receives. When the order is reversed, @route() registers the original undecorated function, and the auth wrapper is never in the call chain. This silently disables authentication on these routes. This vulnerability is fixed in 0.54.8.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-35490 since 04/02/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 0.54.8 eliminates this vulnerability.

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Productinfo

Vendor

• dgtlmoon

Name

• changedetection.io

Version

• 0.54.0
• 0.54.1
• 0.54.2
• 0.54.3
• 0.54.4
• 0.54.5
• 0.54.6
• 0.54.7

Website

• Product: https://github.com/dgtlmoon/changedetection.io/

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