CVE-2026-29038: Webtechnologies Changedetection

Medium severity, CVSS 6.1. EPSS: 0.4% chance of exploitation in the next 30 days.

changedetection.io is a free open source web page change detection tool. Prior to version 0.54.4, there is a reflected cross-site scripting (XSS) vulnerability identified in the /rss/tag/ endpoint of changedetection.io. The tag_uuid path parameter is reflected 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. This issue has been patched in version 0.54.4.

Affected products

• Webtechnologies Changedetection: before 0.54.4 (fixed in 0.54.4)

Published 2026-03-06. Last modified 2026-06-17.