CVE-2026-71203 changedetection.io - Missing Authentication on /api/v1/full-spec Discloses Full OpenAPI Schema
Unauthenticated attackers can access the full OpenAPI schema via the /api/v1/full-spec endpoint, exposing internal API structure.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-71203?
CVE-2026-71203 is a medium-severity missing authorization vulnerability in dgtlmoon changedetection.io, published on 5 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-306
Which versions are affected by CVE-2026-71203?
How do I fix CVE-2026-71203?
No fix has been published for CVE-2026-71203 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-71203 being exploited?
There is no known exploitation of CVE-2026-71203 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as GHSA-9vx6-gpfr-5qq7.