CVE-2026-27645
changedetection.io Vulnerable to Reflected XSS in RSS Single Watch Error Response
CVSS Score
6.1
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-79 |
| Vendor | dgtlmoon |
| Product | changedetection.io |
| Published | Feb 25, 2026 |
| Last Updated | Feb 25, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None
Affected Versions
dgtlmoon / changedetection.io
< 0.54.1