CVE-2026-27645 MEDIUM

CVE-2026-27645: changedetection.io Vulnerable to Reflected XSS in RSS Single Watch Error Response

Vendor Dgtlmoon
Product changedetection.io
Weakness CWE-79 · XSS
Published February 25, 2026
Last update February 25, 2026
View on NVD All CVEs

CVSS base score

6.1/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction Required
Confidentiality Low
Integrity Low

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

February 25, 2026 CVE published
February 25, 2026 Record updated