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CVE-2026-27696

changedetection.io Vulnerable to Server-Side Request Forgery (SSRF) via Watch URLs

HIGH
8.6
CVSS Score
Published: February 25, 2026 at 04:16 AM UTC
Updated: June 17, 2026 at 10:27 AM UTC
2 products affected across 2 vendorsChangedetectionChangedetection

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Severity
HIGH8.6
Exploit prediction
EPSS 0.5%
SSVC
PoC

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Changedetection· Webtechnologies
95%
v < 0.54.1
Changedetection· Dgtlmoon
60%
v < 0.54.1
Affected range stops below 0.54.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

x_refsource_CONFIRMExploitMitigationVendor Advisory
Source: cverecord
https://github.com/dgtlmoon/changedetection.io/security/advisories/GHSA-3c45-4pj5-ch7m
x_refsource_MISCPatch
Source: cverecord
https://github.com/dgtlmoon/changedetection.io/commit/fe7aa38c651d73fe5f41ce09855fa8f97193747b

SSVC — Action Prioritization

SSVCPoCAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.6HIGHGitHub_M
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-918

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