CVE-2026-45609 json
mcp-security: Unvalidated URL Fetching (SSRF)
published 5mo ago modified 3mo ago also GHSA-qjp4-4jvr-xqg3 , EUVD-2026-33323
- cvss
- 7.2
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 10%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- maven org.springaicommunity:mcp-client-security 0.1.9
- springaicommunity mcp_security 0.1.9
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Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 5mo ago
Exploit prediction
0.21% chance of exploitation in the next 30 days, higher than 10% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.2 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N |
| NVD | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N |
| GitHub | 3.1 | 7.2 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| maven | org.springaicommunity:mcp-client-security | <0.1.9 |
0.1.9 |
Affected products
- spring-ai-community mcp-security
Classification
- Weakness
-
- CWE-918 Server-Side Request Forgery
References
-
github.com
/spring-ai-community/mcp-security/pull/68
web
-
github.com
/spring-ai-community/mcp-security/commit/e6b67d8a67cd7acbee6e4c0741c385d62e3ed576
web
-
github.com
/spring-ai-community/mcp-security/security/advisories/GHSA-qjp4-4jvr-xqg3
web, mitigation, vendor-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-45609
advisory
-
github.com
/spring-ai-community/mcp-security
package
-
github.com
/spring-ai-community/mcp-security/releases/tag/v0.1.9
web
Sources
- CVE List CVE-2026-45609
- GitHub Advisory GHSA-qjp4-4jvr-xqg3
- NVD CVE-2026-45609
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