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.
changedetection.io References: https://github.com/dgtlmoon/changedetection.io/security/advisories/GHSA-mw8m-398g-h89w https://github.com/dgtlmoon/changedetection.io/commit/a385c89abf44b52fcfa20c7c6a6dd3047c4c1eb5 https://nvd.nist.gov/vuln/detail/CVE-2026-27645 Remediation: Update to version 0.54.1 or later.
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