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…

PriorityP353high8.6CVSS 3.1

AVNACLPRNUINSCCHINAN

EPSS

0.45%

35.6th percentile

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

3 ranges

Vendor	Product	Version range	Fixed in
dgtlmoon	changedetection.io	< 0.54.1	0.54.1
dgtlmoon	changedetection.io	>= 0 < 0.54.1	0.54.1
webtechnologies	changedetection	< 0.54.1	0.54.1

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