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CVE-2026-71203

MediumPublished

changedetection.io - Missing Authentication on /api/v1/full-spec Discloses Full OpenAPI Schema

Published: Aug 5, 2026
Updated: Aug 10, 2026
Assigning CNA: TuranSec
Evidence observed: Aug 17, 2026

Primary CVSS

5.3/ 10Medium

nvd · CVSS 3.1

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

EPSS probability estimate

0.3%

Low · next 30 days

Percentile: 17.5%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

changedetection.io's REST API resources are protected by an @auth.check_token decorator validating the caller's x-api-key header, except the Spec resource registered at /api/v1/full-spec (changedetectionio/api/Spec.py), whose get method carries neither @auth.check_token nor @validate_openapi_request.

Sources

CVE-2026-71203-PoCPoC
PoC: changedetection.io unauthenticated OpenAPI schema disclosure (CVE-2026-71203, Medium 5.3)

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