Vulnerability Description
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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Webtechnologies | Changedetection | < 0.54.1 |
Related Weaknesses (CWE)
References
- https://github.com/dgtlmoon/changedetection.io/commit/fe7aa38c651d73fe5f41ce0985Patch
- https://github.com/dgtlmoon/changedetection.io/security/advisories/GHSA-3c45-4pjExploitMitigationVendor Advisory
- https://github.com/dgtlmoon/changedetection.io/security/advisories/GHSA-3c45-4pjExploitMitigationVendor Advisory
FAQ
What is CVE-2026-27696?
CVE-2026-27696 is a vulnerability with a CVSS score of 8.6 (HIGH). 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 ...
How severe is CVE-2026-27696?
CVE-2026-27696 has been rated HIGH with a CVSS base score of 8.6/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-27696?
Check the references section above for vendor advisories and patch information. Affected products include: Webtechnologies Changedetection.