{"id":"PYSEC-2026-2126","details":"changedetection.io is a free open source web page change detection tool. In versions prior to 0.54.1, changedetection.io is vulnerable to Server-Side Request Forgery (SSRF) because the URL validation function `is_safe_valid_url()` does not validate the resolved IP address of watch URLs against private, loopback, or link-local address ranges. An authenticated user (or any user when no password is configured, which is the default) can add a watch for internal network URLs. The application fetches these URLs server-side, stores the response content, and makes it viewable through the web UI — enabling full data exfiltration from internal services. Version 0.54.1 contains a fix for the issue.","aliases":["CVE-2026-27696","GHSA-3c45-4pj5-ch7m"],"modified":"2026-07-13T07:15:17.062819699Z","published":"2026-02-25T05:17:26.940Z","references":[{"type":"FIX","url":"https://github.com/dgtlmoon/changedetection.io/commit/fe7aa38c651d73fe5f41ce09855fa8f97193747b"},{"type":"EVIDENCE","url":"https://github.com/dgtlmoon/changedetection.io/security/advisories/GHSA-3c45-4pj5-ch7m"}],"affected":[{"package":{"name":"changedetection-io","ecosystem":"PyPI","purl":"pkg:pypi/changedetection-io"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.54.1"}]}],"versions":["0.38.2","0.39","0.39.1","0.39.10","0.39.10.post1","0.39.10.post2","0.39.11","0.39.12","0.39.13","0.39.13.1","0.39.14","0.39.14.1","0.39.15","0.39.16","0.39.17","0.39.17.1","0.39.17.2","0.39.18","0.39.19","0.39.19.1","0.39.2","0.39.20","0.39.20.1","0.39.20.2","0.39.20.3","0.39.20.4","0.39.21","0.39.21.1","0.39.22","0.39.22.1","0.39.3","0.39.4","0.39.5","0.39.6","0.39.7","0.39.8","0.39.9","0.40.0","0.40.0.1","0.40.0.2","0.40.0.3","0.40.0.4","0.40.1.0","0.40.1.1","0.40.2","0.40.3","0.41","0.41.1","0.42","0.42.1","0.42.2","0.42.3","0.43.1","0.43.2","0.44","0.44.1","0.45","0.45.1","0.45.11","0.45.12","0.45.13","0.45.14","0.45.15","0.45.16","0.45.17","0.45.18","0.45.19","0.45.2","0.45.20","0.45.21","0.45.22","0.45.23","0.45.24","0.45.25","0.45.26","0.45.3","0.45.4","0.45.5","0.45.6","0.45.7","0.45.7.1","0.45.7.2","0.45.7.3","0.45.8","0.45.8.1","0.45.9","0.46.0","0.46.1","0.46.2","0.46.3","0.46.4","0.47.0","0.47.1","0.47.2","0.47.3","0.47.4","0.47.5","0.47.6","0.48.0","0.48.1","0.48.2","0.48.3","0.48.4","0.48.5","0.48.6","0.49.0","0.49.1","0.49.10","0.49.12","0.49.13","0.49.14","0.49.15","0.49.16","0.49.17","0.49.18","0.49.2","0.49.3","0.49.4","0.49.5","0.49.6","0.49.7","0.49.8","0.49.9","0.50.1","0.50.10","0.50.11","0.50.12","0.50.13","0.50.14","0.50.15","0.50.16","0.50.17","0.50.18","0.50.19","0.50.2","0.50.20","0.50.21","0.50.22","0.50.23","0.50.24","0.50.25","0.50.26","0.50.27","0.50.28","0.50.29","0.50.3","0.50.30","0.50.31","0.50.32","0.50.33","0.50.34","0.50.35","0.50.37","0.50.38","0.50.39","0.50.4","0.50.40","0.50.41","0.50.42","0.50.43","0.50.5","0.50.6","0.50.7","0.50.8","0.50.9","0.51.0","0.51.1","0.51.2","0.51.3","0.51.4","0.52.1","0.52.2","0.52.3","0.52.4","0.52.5","0.52.6","0.52.7","0.52.8","0.52.9","0.53.1","0.53.2","0.53.3","0.53.4","0.53.5","0.53.6","0.53.7"],"ecosystem_specific":{},"database_specific":{"source":"https://github.com/pypa/advisory-database/blob/main/vulns/changedetection-io/PYSEC-2026-2126.yaml"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N"}]}