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.
History

Tue, 14 Apr 2026 20:30:00 +0000

Type Values Removed Values Added
First Time appeared Webtechnologies
Webtechnologies changedetection
CPEs cpe:2.3:a:webtechnologies:changedetection:*:*:*:*:*:*:*:*
Vendors & Products Webtechnologies
Webtechnologies changedetection

Thu, 09 Apr 2026 15:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Wed, 08 Apr 2026 20:15:00 +0000

Type Values Removed Values Added
First Time appeared Dgtlmoon
Dgtlmoon changedetection.io
Vendors & Products Dgtlmoon
Dgtlmoon changedetection.io

Tue, 07 Apr 2026 18:00:00 +0000

Type Values Removed Values Added
Description 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.
Title changedetection.io has an Authentication Bypass via Decorator Ordering
Weaknesses CWE-863
References
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-04-07T14:55:24.120Z

Updated: 2026-04-09T14:37:01.267Z

Reserved: 2026-04-02T20:49:44.454Z

Link: CVE-2026-35490

cve-icon Vulnrichment

Updated: 2026-04-09T14:36:52.416Z

cve-icon NVD

Status : Analyzed

Published: 2026-04-07T16:16:27.317

Modified: 2026-04-14T20:27:38.793

Link: CVE-2026-35490

cve-icon Redhat

No data.