CVE-2026-27645
Medium
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.
SeverityMedium
CVSS6.1
Exploit probability—
ProductWebtechnologies Changedetection
PublishedFeb 25, 2026
First seenFeb 25, 2026
Weakness typeCWE-79Cross-site scripting (XSS)
How to fix
Update
- webtechnologies changedetection0.54.1 or later
- changedetection-io0.53.7, 0.54.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| webtechnologies changedetection | v < 0.54.1 | 0.54.1 |
| changedetection-ioPyPI | v < 0.53.7, v < 0.54.1 | 0.53.7, 0.54.1 |
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