CVE-2026-5374: runZero Platform MCP information leak

Severity: medium (CVSS 5.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-04-07 · updated 2026-10-26
Weakness: CWE-863

Description

An issue that allowed MCP agents to access remediation and asset information from outside of the authorized organization scope has been resolved. This is an instance of CWE-863: Incorrect Authorization, and has an estimated CVSS score of CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:N/A:N (5.8 Medium). This issue was fixed in version 4.0.260202.0 of the runZero Platform.

Affected products

runZero Platform: before 4.0.260202.0 — fixed in 4.0.260202.0

How to fix

Upgrade to a fixed version: runZero Platform 4.0.260202.0. Check the vendor advisory for mitigations.

References

https://help.runzero.com/docs/release-notes/#402602020
https://www.runzero.com/advisories/runzero-platform-mcp-infoleak-cve-2026-5374/

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