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.
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History
Tue, 14 Apr 2026 20:30:00 +0000
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| First Time appeared |
Webtechnologies
Webtechnologies changedetection |
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| CPEs | cpe:2.3:a:webtechnologies:changedetection:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Webtechnologies
Webtechnologies changedetection |
Thu, 09 Apr 2026 15:15:00 +0000
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| Metrics |
ssvc
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Wed, 08 Apr 2026 20:15:00 +0000
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Dgtlmoon
Dgtlmoon changedetection.io |
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| Vendors & Products |
Dgtlmoon
Dgtlmoon changedetection.io |
Tue, 07 Apr 2026 18:00:00 +0000
| Type | Values Removed | Values Added |
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| 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 |
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| Metrics |
cvssV3_1
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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
Updated: 2026-04-09T14:36:52.416Z
Status : Analyzed
Published: 2026-04-07T16:16:27.317
Modified: 2026-04-14T20:27:38.793
Link: CVE-2026-35490
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