CVE-2026-27696

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.

• CWE-918

• https://github.com/dgtlmoon/changedetection.io/commit/fe7aa38c651d73fe5f41ce09855fa8f97193747bPatch
• https://github.com/dgtlmoon/changedetection.io/security/advisories/GHSA-3c45-4pj5-ch7mExploit, Mitigation, Vendor Advisory
• https://github.com/dgtlmoon/changedetection.io/security/advisories/GHSA-3c45-4pj5-ch7mExploit, Mitigation, Vendor Advisory

Published

Feb 25, 2026

Last Modified

Jun 17, 2026

Status

Analyzed

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