CVE-2026-19373Public exploit

Internal service access via unchecked apiUrl

Published Aug 9, 2026 · Updated Aug 9, 2026

Server-side request forgery in PhialsBasement Kobold MCP Server 1.0.0 allows local users to reach internal HTTP services via apiUrl. BaseConfigSchema accepts the caller-controlled apiUrl string, and makeRequest concatenates endpoint paths before passing the result to fetch without destination validation. An MCP caller with local access can make requests from the server's network position to loopback, private-network, metadata, or attacker-controlled hosts.

CVSS severityUnavailable
Unscored
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Server-side request forgery in PhialsBasement Kobold MCP Server 1.0.0 allows local users to reach internal HTTP services via apiUrl. BaseConfigSchema accepts the caller-controlled apiUrl string, and makeRequest concatenates endpoint paths before passing the result to fetch without destination validation. An MCP caller with local access can make requests from the server's network position to loopback, private-network, metadata, or attacker-controlled hosts.

The record

CVE
CVE-2026-19373
Published
Aug 9, 2026
Updated
Aug 9, 2026
Vendor
PhialsBasement
Product
Kobold MCP Server
Classifications
CWE-918, CAPEC-664, T1090
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 9, 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=1.0.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

PhialsBasement · Kobold MCP Serverversion=1.0.0

Published CVSS scores

4.8VulDB CNACVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
5.3VulDB CNACVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R
4.3VulDB CNAAV:L/AC:L/Au:S/C:P/I:P/A:P/E:POC/RL:ND/RC:UR
5.3VulDB CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

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

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
CAPEC-664Server Side Request Forgery
T1090Proxy

Public exploit references

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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