CVE-2026-45609Network attack vector

Internal network requests via unvalidated OAuth URLs

Published May 29, 2026 · Updated May 29, 2026

SSRF in MCP Security before 0.1.9 allows remote attackers to make OAuth discovery requests to internal or malicious URLs. McpMetadataDiscoveryService and DynamicClientRegistrationService fetch server-supplied metadata and OAuth endpoint URLs without validating their destinations. Dynamic Client Registration must be enabled, allowing requests to reach services accessible from the application's network position.

CVSS severity7.2
High
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

SSRF in MCP Security before 0.1.9 allows remote attackers to make OAuth discovery requests to internal or malicious URLs. McpMetadataDiscoveryService and DynamicClientRegistrationService fetch server-supplied metadata and OAuth endpoint URLs without validating their destinations. Dynamic Client Registration must be enabled, allowing requests to reach services accessible from the application's network position.

The record

CVE
CVE-2026-45609
Published
May 29, 2026
Updated
May 29, 2026
Vendor
Spring AI Community
Product
MCP Security
Classifications
CWE-918
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 29, 2026CVE publishedPublication date reported by the CVE source.
  2. May 29, 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=< 0.1.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Spring AI Community · MCP Securityversion=< 0.1.9

Published CVSS scores

6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
7.2GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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