CVE-2026-19765Public exploitNetwork attack vector

Authenticated SSRF via unchecked source URL fetch

Published Aug 14, 2026 · Updated Aug 14, 2026

Server-side request forgery in swagger-testcase-mcp allows remote authenticated users to access internal services through crafted source URLs. The loadSource function passes the source string directly to fetch() without destination or network-boundary validation and forwards optional headers. An MCP caller with tool access can read returned JSON or YAML bodies and forward supplied authentication headers to an attacker-controlled endpoint.

CVSS severity5.3
Medium
EPSS probability0.21%
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 swagger-testcase-mcp allows remote authenticated users to access internal services through crafted source URLs. The loadSource function passes the source string directly to fetch() without destination or network-boundary validation and forwards optional headers. An MCP caller with tool access can read returned JSON or YAML bodies and forward supplied authentication headers to an attacker-controlled endpoint.

The record

CVE
CVE-2026-19765
Published
Aug 14, 2026
Updated
Aug 14, 2026
Vendor
eyaushev
Product
swagger-testcase-mcp
Classifications
CWE-918, CAPEC-664
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 14, 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=5babb27c951fb404bc2b25ec80593616e49054e5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

eyaushev · swagger-testcase-mcpversion=5babb27c951fb404bc2b25ec80593616e49054e5

Published CVSS scores

6.5VulDBAV:N/AC:L/Au:S/C:P/I:P/A:P
6.3VulDBCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
6.3VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
5.3VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

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

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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