CVE-2026-27645
changedetection.io Vulnerable to Reflected XSS in RSS Single Watch Error Response
- State
- Published
- Severity
- 6.1 Medium
- Published
- Feb 25, 2026
- Updated
- Feb 25, 2026
- Reserved
- Feb 20, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 6.1 Medium | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N | GitHub_M |
Weaknesses
- CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Products
| Product | Versions |
|---|---|
changedetection.iodgtlmoon |
|
References
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