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Back to active CVEs
Medium · CVSS 5.1CVE-2026-123271

ChatCLI before v1.215.2 Origin Validation Error via Unvalidated MCP OAuth Resource IndicatorCVE-2026-123271

Answer in brief

CVE-2026-123271 records a Medium severity (CVSS 5.1) vulnerability in ChatCLI before v1.215.2 Origin Validation Error via Unvalidated MCP OAuth Resource Indicator. The current sources do not mark it as known exploited. The current feed maps diillson/ChatCLI (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 Nov 5, 2026Updated Nov 5, 2026Source checked Nov 5, 2026First seen by HOL Nov 5, 2026Material review Nov 5, 2026
Upstream Advisory

Record context

Vulnerability class
Tool Poisoning
EPSS
Not reported
CWE IDs
CWE-346
Source
CVE List V5
Source checked
Nov 5, 2026
References
5 linked sources
Open source record

Key facts

Risk
Medium · CVSS 5.1
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 5.1. 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 diillson/ChatCLI (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
diillson/ChatCLIgeneric>=v1.159.0 <v1.215.2v1.215.2

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for diillson/ChatCLI.
  2. 2Review the reported fix. Update diillson/ChatCLI to v1.215.2 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Nov 5, 2026

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

  2. Source modified

    Nov 5, 2026

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

  3. First seen by HOL

    Nov 5, 2026

Sources and claim methodology

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

ChatCLI before v1.215.2 contains an improper validation vulnerability in the MCP OAuth login flow that uses server-supplied Protected Resource Metadata as the resource indicator without checking it matches the configured server URL. A malicious MCP server can declare another resource on the same authorization server, obtain the user's bearer token for it, and replay that token against the other resource.

Quoted source text, attributed separately from HOL analysis.