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  4. CVE 2026 81098 telnyx mcp server through 6830 missing
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Back to active CVEs
Critical · CVSS 9.1CVE-2026-81098

Telnyx MCP Server through 6.83.0 Missing Authentication on Streamable HTTP TransportCVE-2026-81098

Answer in brief

CVE-2026-81098 records a Critical severity (CVSS 9.1) vulnerability in Telnyx MCP Server through 6.83.0 Missing Authentication on Streamable HTTP Transport. The current sources do not mark it as known exploited. The current feed maps team-telnyx/telnyx-mcp (generic), team-telnyx/telnyx-mcp (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 Aug 27, 2026Updated Sep 24, 2026Source checked Oct 11, 2026First seen by HOL Aug 27, 2026Material review Sep 24, 2026
Upstream Advisory

Key facts

Risk
Critical · CVSS 9.1
Exploitation
Not marked as known exploited
Affected software
2 mapped packages or products
Fix availability
Not reported

Why this deserves its current priority

CVSS is 9.1. 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 team-telnyx/telnyx-mcp (generic), team-telnyx/telnyx-mcp (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
team-telnyx/telnyx-mcpgeneric0Not reported
team-telnyx/telnyx-mcpgeneric>=0 <=6.83.0Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for team-telnyx/telnyx-mcp, team-telnyx/telnyx-mcp.
  2. 2Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

  1. Published upstream

    Aug 27, 2026

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

  2. Source modified

    Sep 24, 2026

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

  3. First seen by HOL

    Aug 27, 2026

Sources and claim methodology

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

The Telnyx MCP server exposed its HTTP transport on every interface and did not require a caller credential. packages/mcp-server/src/http.ts served MCP on the root path with a listener bound to all interfaces and parsed the caller's authentication headers in a mode that did not fail when they were absent, so a request without any credential completed initialisation and dispatched tools. Dispatch forwarded the server's own stored credentials, the Telnyx API key and client secret together with the code-execution key, to the upstream endpoint, so an unauthenticated caller able to reach the port acted with them. The current code defaults the host to loopback, requires a server API key, and enforces it in middleware.

Quoted source text, attributed separately from HOL analysis.

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Record context

Vulnerability class
Missing Auth
EPSS
Not reported
CWE IDs
CWE-306
Source
CVE List V5
Source checked
Oct 11, 2026
References
4 linked sources
Open source record