CVE-2026-81846: runZero MCP 'Findings summaries' Data Leak

Severity: low (CVSS 3.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-01 · updated 2026-09-09
Weakness: CWE-639

Description

An authorization bypass in the runZero Platform MCP service has been resolved in version 5.1.260826.0. This issue is an instance of CWE-639: Authorization Bypass Through User-Controlled Key and has an estimated CVSS score of CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N (3.5 Low).

Affected products

runZero Platform: from 4.0.251031.0 through 5.1.260825.0

References

https://help.runzero.com/docs/release-notes/#512608260
https://www.runzero.com/advisories/runzero-mcp-findings-summaries-data-leak-cve-2026-81846

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