Vulnerability · Published May 29, 2026 · Assigned by GitHub_M

CVE-2026-45609mcp-security: Unvalidated URL Fetching (SSRF)

High 7.2

In plain English

A high-severity server-side request forgery in mcp-security from spring-ai-community. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 11% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.2High

Exploit odds (30 days)0.2%top 89.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

mcp-security provides Security and Authorization support for Model Context Protocol in Spring AI. Prior to 0.1.9, the mcp-security framework fails to implement the mandatory SSRF mitigations outlined in the Model Context Protocol (MCP) security specifications. Specifically, it processes untrusted URLs for OAuth-related discovery and metadata without verifying if the targets are malicious or internal to the network. This only affects installations with Dynamic Client Registration (DCR) enabled This vulnerability is fixed in 0.1.9.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Maven	org.springaicommunity:mcp-client-security	0.1.9	GHSA-qjp4-4jvr-xqg3

Affected products (as reported)

Vendor	Product	Versions
spring-ai-community	mcp-security	< 0.1.9

Weakness: CWE-918 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

References

https://github.com/spring-ai-community/mcp-security/security/advisories/GHSA-qjp4-4jvr-xqg3 x_refsource_CONFIRM