Vulnerability · Published Aug 5, 2026 · Assigned by TuranSec

CVE-2026-71203changedetection.io - Missing Authentication on /api/v1/full-spec Discloses Full OpenAPI Schema

Medium 5.3

In plain English

A medium-severity missing authentication in changedetection.io from dgtlmoon. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 24% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code.

Severity (CVSS 3.1)5.3Medium

Exploit odds (30 days)0.3%top 75.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack tooling1Public PoC

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.

Affected products (as reported)

Vendor	Product	Versions
dgtlmoon	changedetection.io	0.55.7

Weakness: CWE-306 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

References

https://github.com/dgtlmoon/changedetection.io third-party-advisory