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Back to active CVEs
High · CVSS 8.8CVE-2026-105797

SimpleChat: Command injection via authorization-gate ordering flaw (arbitrary process spawn through MCP stdio transport)CVE-2026-105797

Answer in brief

CVE-2026-105797 records a High severity (CVSS 8.8) vulnerability in SimpleChat: Command injection via authorization-gate ordering flaw (arbitrary process spawn through MCP stdio transport). The current sources do not mark it as known exploited. The current feed maps microsoft/simplechat (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 6, 2026Updated Oct 6, 2026Source checked Oct 6, 2026First seen by HOL Oct 6, 2026Material review Oct 6, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 8.8
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 8.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps microsoft/simplechat (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
microsoft/simplechatgeneric<0.261.0310.261.031

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for microsoft/simplechat.
  2. 2Review the reported fix. Update microsoft/simplechat to 0.261.031 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 6, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 6, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 6, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
Upstream source description

SimpleChat is a secure AI conversation application with personal and group workspaces for document-grounded interactions. In versions 0.261.003 and 0.261.027, an authorization ordering flaw in POST /api/user/plugins allows an authenticated low-privileged user to omit the top-level MCP type so that _reject_non_admin_mcp_stdio skips inspection before the type is restored from metadata. The stored personal action can then reach McpPluginFactory.create_connector, and MCPStdioPlugin.connect starts the attacker-selected operating-system process under the application service identity when the action tool is invoked. Exploitation requires personal plugins to be enabled and governance to permit MCP actions, and it can expose or modify secrets and data available to the service or disrupt the service. This issue is fixed in version 0.261.031.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • SimpleChat: Stored XSS via group document filename in inline onclick handlerSame microsoft/simplechat package
  • Microsoft UFO: Authenticated Android shell command injection in Mobile MCP type_text and launch_appAlso CWE-78
  • Microsoft UFO: Authenticated Android shell command injection in Mobile MCP `press_key`Also CWE-78
  • Payload: Sort queries could expose protected field informationAlso CWE-863
  • lrzsz before 0.13.0 OS Command Injection via lrz Pipe ModeAlso CWE-78
  • OS Command Injection in Felisify Informatics' SambaBoxAlso CWE-78

Record context

Vulnerability class
Command Injection
EPSS
Not reported
CWE IDs
CWE-78, CWE-863
Source
CVE List V5
Source checked
Oct 6, 2026
References
2 linked sources
Open source record