CVE-2026-81098Network attack vectorHinoki check available

Unauthenticated tool execution via optional HTTP credentials

Published Aug 27, 2026 · Updated Aug 27, 2026

Missing authentication in Telnyx MCP Server 6.83.0 and earlier allows remote attackers to invoke tools with stored credentials. The root-path HTTP handler binds to every interface, accepts absent authentication headers, and initializes an MCP session with the server's Telnyx and code-execution credentials. Network reachability to the configured port is sufficient to dispatch tools that act through those stored credentials, including the code tool.

CVSS severityUnavailable
Unscored
EPSS probability0.51%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Missing authentication in Telnyx MCP Server 6.83.0 and earlier allows remote attackers to invoke tools with stored credentials. The root-path HTTP handler binds to every interface, accepts absent authentication headers, and initializes an MCP session with the server's Telnyx and code-execution credentials. Network reachability to the configured port is sufficient to dispatch tools that act through those stored credentials, including the code tool.

The record

CVE
CVE-2026-81098
Published
Aug 27, 2026
Updated
Aug 27, 2026
Vendor
Telnyx
Product
Telnyx MCP Server
Classifications
T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=6.83.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Telnyx · Telnyx MCP Serverversion=0 <=6.83.0

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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