---
title: "CVE-2026-105797: SimpleChat - Command Injection"
description: "SimpleChat 0.261.003 and 0.261.027 contain a command injection caused by an authorization ordering flaw in POST /api/user/plugins, letting authenticated low-privileged users execute OS processes under the service identity, exploit requires personal plugins enabled and governance permitting MCP actions."
url: https://panop.io/threat-heartbeat/CVE-2026-105797/
---

# CVE-2026-105797 SimpleChat - Command Injection

SimpleChat 0.261.003 and 0.261.027 contain a command injection caused by an authorization ordering flaw in POST /api/user/plugins, letting authenticated low-privileged users execute OS processes under the service identity, exploit requires personal plugins enabled and governance permitting MCP actions.

CVSS base score 8.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.56% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-105797)

## Details

Type

Command Injection

Impact

Remote Code Execution, Information Disclosure, Data Tampering, Denial Of Service

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Published

6 October 2026

Updated

15 October 2026

Weakness

[CWE-78](https://cwe.mitre.org/data/definitions/78.html)

## Vendor fix

Update to version 0.261.031 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-105797](https://nvd.nist.gov/vuln/detail/CVE-2026-105797)
- [https://github.com/microsoft/simplechat/commit/73ff7d6998dc4827a0f6ba002386275a7c1ec804](https://github.com/microsoft/simplechat/commit/73ff7d6998dc4827a0f6ba002386275a7c1ec804)
- [https://github.com/microsoft/simplechat/security/advisories/GHSA-h4mw-qw8m-5x4j](https://github.com/microsoft/simplechat/security/advisories/GHSA-h4mw-qw8m-5x4j)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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