# CVE-2026-66723 — CERT.PL MWDB Core

> As of 2026-07-29, CVE-2026-66723 is a High-severity (band derived from the CVSS v4.0 score, not stated by the CNA) vulnerability in CERT.PL MWDB Core, CVSS v4.0 7, EPSS 0.4% (39.7th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-66723, most recently “CVE-2026-66723: Missing Authorization in MWDB Core Remote Instances Proxy API”.

**Last updated:** 2026-07-29

## What is CVE-2026-66723?

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

The record classifies CVE-2026-66723 under weakness class [CWE-862](https://intel.threadlinqs.com/cwe/CWE-862). 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 68 days ago.

## Severity and exploitation probability

- **CVSS v4.0 base score:** 7 — High (derived from score) (`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`)
- **EPSS (FIRST):** 0.4% probability of exploitation in the next 30 days, higher than 39.7% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 5.1/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-07-29

## Is CVE-2026-66723 being exploited?

No public exploitation evidence for CVE-2026-66723 is recorded in the sources Threadlinqs tracks — CISA KEV, Exploit-DB, public proof-of-concept repositories and ProjectDiscovery Nuclei — as of 2026-07-29. That is an absence of evidence in those feeds, not a guarantee that the vulnerability is unexploited.

## Affected products and versions

- **CERT.PL**: MWDB Core

## How to fix CVE-2026-66723

No vendor patch reference has been recorded for CVE-2026-66723 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-66723

1 tracked threat in the Threadlinqs corpus references CVE-2026-66723, either in the campaign’s CVE list or as an indicator on the campaign record.

- [CVE-2026-66723: Missing Authorization in MWDB Core Remote Instances Proxy API](https://intel.threadlinqs.com/threat/TL-2026-1821) — HIGH · 2026-07-29

## Sources

Enriched from CVE.org, NVD, FIRST EPSS. Last verified by Threadlinqs on 2026-08-02. This product uses the NVD API but is not endorsed or certified by the NVD.

**Vendor advisory and patch**

- [cert.pl — vendor advisory](https://cert.pl/en/posts/2026/07/CVE-2026-66723)
- [github.com — vendor advisory](https://github.com/CERT-Polska/mwdb-core/security/advisories/GHSA-942c-r7qj-w895)
- [github.com — patch](https://github.com/CERT-Polska/mwdb-core/releases/tag/v2.19.0)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-66723
Full detection coverage and IOCs for threats exploiting CVE-2026-66723 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp