What is the CVSS score of CVE-2026-27696?

CVE-2026-27696 has a CVSS 3.1 base score of 8.6 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N. EPSS exploitation probability: 0.0%.

Which versions of Changedetection are affected by CVE-2026-27696?

CVE-2026-27696 affects changedetection.io, a web monitoring tool, with HIGH severity (CVSS 8.6) and active public exploits available.. A patch is available.

Is there a public PoC exploit available for CVE-2026-27696?

Yes, a public proof-of-concept exploit is available for CVE-2026-27696. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2026-27696?

Within 24 hours: Identify all changedetection.io instances in your environment and assess current version/patch status. Within 7 days: Apply the available vendor patch to all identified instances and validate successful deployment. Within 30 days: Conduct post-patch security testing and update asset inventory to reflect patched status.

Changedetection CVE-2026-27696

HIGH

Server-Side Request Forgery (SSRF) (CWE-918)

2026-02-25 security-advisories@github.com

GHSA-3c45-4pj5-ch7m

SSRF Changedetection

8.6

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

8.6 HIGH

AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

None

Availability

None

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:55 vuln.today

PoC Detected

Feb 26, 2026 - 15:34 vuln.today

Public exploit code

Patch released

Feb 26, 2026 - 15:34 nvd

Patch available

CVE Published

Feb 25, 2026 - 05:17 nvd

HIGH 8.6

DescriptionGitHub Advisory

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.

AnalysisAI

changedetection.io is a free open source web page change detection tool. [CVSS 8.6 HIGH]

Technical ContextAI

Classified as CWE-918 (Server-Side Request Forgery (SSRF)). Affects Changedetection. 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