CVE-2026-27645 | THREATINT

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.

PUBLISHED Reserved 2026-02-20 | Published 2026-02-25 | Updated 2026-02-25 | Assigner GitHub_M

MEDIUM: 6.1CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Problem types

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Product status

< 0.54.1

affected

References

github.com/...ion.io/security/advisories/GHSA-mw8m-398g-h89w exploit

github.com/...ion.io/security/advisories/GHSA-mw8m-398g-h89w

github.com/...ommit/a385c89abf44b52fcfa20c7c6a6dd3047c4c1eb5

cve.org (CVE-2026-27645)

nvd.nist.gov (CVE-2026-27645)

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