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CVE-2026-27696

Webtechnologies Changedetection server-side request forgery (SSRF)

8.6 HIGHPublic exploitEPSS 0.48%
  1. Published25 Feb 2026

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 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityNone
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

Affected products

Webtechnologies Changedetection< 0.54.1

Remediation

Fixed in
Webtechnologies Changedetection≥ 0.54.1

References

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Frequently asked

Is CVE-2026-27696 being actively exploited?

CVE-2026-27696 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.48%.

How severe is CVE-2026-27696?

CVE-2026-27696 has a CVSS 3.1 base score of 8.6, rated high. EPSS estimates a 0.48% probability of exploitation.

Which products are affected by CVE-2026-27696?

Affected products include Webtechnologies Changedetection.

How do I fix CVE-2026-27696?

Upgrade affected software to a fixed version, for example Webtechnologies Changedetection 0.54.1 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-27696 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.