{"id":"CVE-2026-27645","aliases":["GHSA-mw8m-398g-h89w","PYSEC-2026-2125"],"url":"https://o3.security/vulnerability/CVE-2026-27645","summary":"changedetection.io Vulnerable to Reflected XSS in RSS Single Watch Error Response","details":"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":"2026-02-25T04:06:58.183Z","modified":"2026-07-15T01:49:00.422169469Z","cvss":{"score":6.1,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"changedetection-io","fixedVersion":"0.53.7"}],"fix":{"url":"https://github.com/dgtlmoon/changedetection.io/commit/a385c89abf44b52fcfa20c7c6a6dd3047c4c1eb5","label":"dgtlmoon/changedetection.io@a385c89"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27645.json"},{"type":"ADVISORY","url":"https://github.com/dgtlmoon/changedetection.io/security/advisories/GHSA-mw8m-398g-h89w"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-27645"},{"type":"FIX","url":"https://github.com/dgtlmoon/changedetection.io/commit/a385c89abf44b52fcfa20c7c6a6dd3047c4c1eb5"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-15T01:49:00.422169469Z"}}