CVE-2026-27696

The record

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.

Affected packages

Related vulnerabilities

• GHSA-3c45-4pj5-ch7m changedetection.io is Vulnerable to SSRF via Watch URLs Same vulnerability
• CVE-2026-29065 changedetection.io is a free open source web page change detection tool. Also affects changedetection-io
• CVE-2026-29039 changedetection.io is a free open source web page change detection tool. Also affects changedetection-io
• CVE-2026-29038 changedetection.io is a free open source web page change detection tool. Also affects changedetection-io
• GHSA-25g8-2mcf-fcx9 changedetection.io has Zip Slip vulnerability in the backup restore functionality Also affects changedetection-io
• GHSA-6fmw-82m7-jq6p changedetection.io vulnerable to XPath - Arbitrary File Read via unparsed-text() Also affects changedetection-io
• GHSA-8whx-v8qq-pq64 changedetection.io has Reflected XSS in its RSS Tag Error Response Also affects changedetection-io
• GHSA-mw8m-398g-h89w changedetection.io Vulnerable to Reflected XSS in RSS Single Watch Error Response Also affects changedetection-io