Is this vulnerability remotely exploitable over the internet?

Yes. If the changedetection.io instance is reachable over the network and is running with no password (the default) or with weak/guessable credentials, a remote attacker can create watches pointing to internal URLs, effectively exploiting SSRF from anywhere they can access the web UI.

What level of access does an attacker need to exploit this issue?

The attacker needs the ability to add or modify watch URLs. By default, this may require no authentication if a password is not configured. In deployments where authentication is enabled, any authenticated user with permission to create or edit watches can potentially exploit the bug.

What is the safest general fix pattern for developers?

The most robust pattern is to combine strict URL allowlisting with IP-based network restrictions: resolve hostnames, block private/loopback/link-local ranges, and only permit connections to explicitly trusted domains or hosts. Additionally, ensure the application never acts as a generic proxy for arbitrary user-supplied URLs.

Severity:

HIGH RISK

(8.6)

Server-Side Request Forgery (CWE-918) in changedetection.io Watch URL Handling

CVE-2026-27696

Published:

Feb 24, 2026

Status:

Analyzed

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

Recent Vulnerabilities

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

Remote Code Execution on the Router

April 6, 2026

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Remote Code Execution on Router Firmware

April 6, 2026

Vulnerability Type

Category:

Server-Side Request Forgery (SSRF)

CWE:

CWE-918

Impact:

Internal Network Data Exfiltration via SSRF

Severity:

HIGH RISK

(8.6)

CVSS Version:

3.1

Vulnerability Type

Category:

Server-Side Request Forgery (SSRF)

CWE:

CWE-918

Impact:

Internal Network Data Exfiltration via SSRF

Severity:

HIGH RISK

(8.6)

CVSS Version:

3.1

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Ask AI for summary of CodeAnt

Server-Side Request Forgery (CWE-918) in changedetection.io Watch URL Handling

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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