CVE-2026-7147Public exploitNetwork attack vector

Internal resource access via unvalidated base URL

Published Apr 27, 2026 · Updated Apr 27, 2026

Server-side request forgery in JoeCastrom MCP Chat Studio 1.0 through 1.5.0 allows remote attackers to access internal HTTP resources. The /api/llm/models handler passes req.query.base_url directly to fetch() as the destination for an /api/tags request without scheme, host, or address validation. The attacker must reach the HTTP route, and server egress determines which loopback, private-network, link-local, or metadata services can be queried.

CVSS severity7.3
High
EPSS probability0.28%
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 JoeCastrom MCP Chat Studio 1.0 through 1.5.0 allows remote attackers to access internal HTTP resources. The /api/llm/models handler passes req.query.base_url directly to fetch() as the destination for an /api/tags request without scheme, host, or address validation. The attacker must reach the HTTP route, and server egress determines which loopback, private-network, link-local, or metadata services can be queried.

The record

CVE
CVE-2026-7147
Published
Apr 27, 2026
Updated
Apr 27, 2026
Vendor
JoeCastrom
Product
MCP Chat Studio
Classifications
CWE-918, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 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=1.0
  2. Affected versionversion=1.1
  3. Affected versionversion=1.2
  4. Affected versionversion=1.3
  5. Affected versionversion=1.4
  6. Affected versionversion=1.5.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

JoeCastrom · MCP Chat Studioversion=1.0; version=1.1; version=1.2; version=1.3; version=1.4; version=1.5.0

Published CVSS scores

5.5VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
6.9VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N
7.3VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
7.5VulDBAV:N/AC:L/Au:N/C:P/I:P/A:P

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
T1190Exploit Public-Facing Application

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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