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CVE-2026-35490— changedetection.io has an Authentication Bypass via Decorator Ordering

Quick assessment

Affected
dgtlmoon changedetection.io
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

changedetection.io是dgtlmoon个人开发者的一个网站变更检测、监控和通知应用程序。 changedetection.io 0.54.8之前版本存在安全漏洞，该漏洞源于@login_optionally_required装饰器放置在@blueprint.route()之前（外部）而非之后，可能导致这些路由上的身份验证被静默禁用。

CVSS 9.8 · Critical EPSS 0.64% · P49

Possible ATT&CK Techniques 1 AI

T1078.003 · Local Accounts
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I. Basic Information for CVE-2026-35490

Vulnerability Information
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Vulnerability Title
changedetection.io has an Authentication Bypass via Decorator Ordering
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5
Vulnerability Title
changedetection.io 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
changedetection.io是dgtlmoon个人开发者的一个网站变更检测、监控和通知应用程序。 changedetection.io 0.54.8之前版本存在安全漏洞，该漏洞源于@login_optionally_required装饰器放置在@blueprint.route()之前（外部）而非之后，可能导致这些路由上的身份验证被静默禁用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
dgtlmoon changedetection.io < 0.54.8 -

II. Public POCs for CVE-2026-35490

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III. Intelligence Information for CVE-2026-35490

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Vendor Advisories for CVE-2026-35490 (1)

IV. Related Vulnerabilities

Same product: changedetection.io
Same vendor: dgtlmoon
Same weakness: CWE-863

V. Comments for CVE-2026-35490

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