CVE-2026-27645
MEDIUM
GHSA-mw8m-398g-h89w
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Lifecycle Timeline
4Tags
Description
changedetection.io is a free open source web page change detection tool. In versions prior to 0.54.1, the RSS single-watch endpoint reflects the UUID path parameter directly in the HTTP response body without HTML escaping. Since Flask returns text/html by default for plain string responses, the browser parses and executes injected JavaScript. Version 0.54.1 contains a fix for the issue.
Analysis
changedetection.io versions before 0.54.1 are vulnerable to reflected cross-site scripting (XSS) via the RSS endpoint, where user-supplied UUID parameters are rendered without HTML encoding in text/html responses, allowing attackers to execute arbitrary JavaScript in users' browsers. Public exploit code exists for this vulnerability. …
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Remediation
Within 30 days: Identify affected systems running versions and apply vendor patches as part of regular patch cycle. Verify Content-Security-Policy and output encoding.
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External POC / Exploit Code
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