CVE-2026-45609

MEDIUMNVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.5 under NVD CVSS v3. EPSS exploit probability: 0.2%, top 90% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
6.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 6.5Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
6.5
EG Score
6.5(medium)
EPSS
9.8%
KEV
Not listed

Published

May 18, 2026

Last Modified

June 3, 2026

Advisory Details (1)

Auto-updated Jun 15, 2026
Patch available. Sources: github.
github Patch Available

Unvalidated URL Fetching (SSRF) in MCP Client · Advisory · spring-ai-community/mcp-security · GitHub

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

Vendor Advisories for CVE-2026-45609(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
Maven(1)
PackageVulnerable rangeFixed inDependents
org.springaicommunity:mcp-client-security0.0.1 ... 0.1.8 (15 versions)0.1.9—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 7× in last 7d / 43× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-12 05:46 UTCEPSS rescore
  2. 2026-07-11 08:27 UTCEPSS rescore
  3. 2026-07-09 19:10 UTCEPSS rescore
  4. 2026-07-08 15:16 UTCEPSS rescore
  5. 2026-07-07 13:46 UTCEPSS rescore
  6. 2026-07-06 16:27 UTCEPSS rescore
  7. 2026-07-06 02:23 UTCEPSS rescore
  8. 2026-07-05 02:30 UTCEPSS rescore
  9. 2026-07-04 06:31 UTCEPSS rescore
  10. 2026-07-01 15:07 UTCEPSS rescore
  11. 2026-06-30 23:22 UTCEPSS rescore
  12. 2026-06-29 21:10 UTCEG score recompute
  13. 2026-06-29 14:06 UTCEPSS rescore
  14. 2026-06-29 14:06 UTCEPSS rescore
  15. 2026-06-28 14:07 UTCEPSS rescore
  16. 2026-06-28 04:56 UTCEPSS rescore
  17. 2026-06-28 04:56 UTCEPSS rescore
  18. 2026-06-27 21:23 UTCEG score recompute
  19. 2026-06-27 03:08 UTCEPSS rescore
  20. 2026-06-26 19:57 UTCEG score recompute
  21. 2026-06-25 17:48 UTCEG score recompute
  22. 2026-06-25 13:49 UTCEPSS rescore
  23. 2026-06-24 14:05 UTCEPSS rescore
  24. 2026-06-23 21:33 UTCEPSS rescore
  25. 2026-06-23 21:33 UTCEPSS rescore
Show 62 more
  1. 2026-06-22 14:25 UTCEPSS rescore
  2. 2026-06-22 14:25 UTCEPSS rescore
  3. 2026-06-21 14:56 UTCEPSS rescore
  4. 2026-06-21 14:56 UTCEPSS rescore
  5. 2026-06-21 01:59 UTCEPSS rescore
  6. 2026-06-19 19:25 UTCEPSS rescore
  7. 2026-06-17 22:46 UTCEG score recompute
  8. 2026-06-17 17:53 UTCEPSS rescore
  9. 2026-06-16 23:03 UTCEG score recompute
  10. 2026-06-16 17:52 UTCEPSS rescore
  11. 2026-06-15 23:14 UTCEG score recompute
  12. 2026-06-15 17:49 UTCEPSS rescore
  13. 2026-06-14 22:42 UTCEG score recompute
  14. 2026-06-13 23:01 UTCEG score recompute
  15. 2026-06-13 23:00 UTCEPSS rescore
  16. 2026-06-12 23:16 UTCEG score recompute
  17. 2026-06-12 23:12 UTCEPSS rescore
  18. 2026-06-12 23:12 UTCEPSS rescore
  19. 2026-06-11 23:35 UTCEG score recompute
  20. 2026-06-11 14:00 UTCEPSS rescore
  21. 2026-06-10 23:53 UTCEG score recompute
  22. 2026-06-10 22:18 UTCEPSS rescore
  23. 2026-06-10 13:22 UTCEPSS rescore
  24. 2026-06-10 13:22 UTCEPSS rescore
  25. 2026-06-10 00:09 UTCEG score recompute
  26. 2026-06-09 00:28 UTCEG score recompute▼ 0.70
  27. 2026-06-08 23:31 UTCNVD updateCVSS v3 → 6.5 · severity → MEDIUM
  28. 2026-06-08 14:17 UTCEPSS rescore
  29. 2026-06-08 14:17 UTCEPSS rescore
  30. 2026-06-08 12:45 UTCEG score recompute
  31. 2026-06-08 01:04 UTCEG score recompute
  32. 2026-06-07 15:25 UTCEPSS rescore
  33. 2026-06-07 15:25 UTCEPSS rescore
  34. 2026-06-07 13:22 UTCEG score recompute
  35. 2026-06-07 01:40 UTCEG score recompute
  36. 2026-06-06 13:58 UTCEG score recompute
  37. 2026-06-06 13:47 UTCEPSS rescore
  38. 2026-06-06 13:47 UTCEPSS rescore
  39. 2026-06-06 02:16 UTCEG score recompute
  40. 2026-06-05 22:47 UTCEPSS rescore
  41. 2026-06-05 14:35 UTCEG score recompute
  42. 2026-06-05 06:10 UTCEPSS rescore
  43. 2026-06-05 06:10 UTCEPSS rescore
  44. 2026-06-05 02:53 UTCEG score recompute
  45. 2026-06-04 15:11 UTCEG score recompute
  46. 2026-06-04 13:12 UTCEPSS rescore
  47. 2026-06-04 13:12 UTCEPSS rescore
  48. 2026-06-04 03:29 UTCEG score recompute
  49. 2026-06-03 15:47 UTCEG score recompute
  50. 2026-06-03 04:05 UTCEG score recompute
  51. 2026-06-02 20:13 UTCEPSS rescore
  52. 2026-06-02 16:23 UTCEG score recompute
  53. 2026-06-02 04:41 UTCEG score recompute
  54. 2026-06-01 16:59 UTCEG score recompute
  55. 2026-06-01 13:52 UTCEPSS rescore
  56. 2026-06-01 13:52 UTCEPSS rescore
  57. 2026-06-01 05:17 UTCEG score recompute
  58. 2026-05-31 22:30 UTCEPSS rescore
  59. 2026-05-31 22:30 UTCEPSS rescore
  60. 2026-05-31 00:16 UTCEPSS rescore
  61. 2026-05-31 00:16 UTCEPSS rescore
  62. 2026-05-24 06:18 UTCEG score recompute

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-45609?
CVE-2026-45609 is a medium vulnerability published on May 18, 2026. 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…
When was CVE-2026-45609 disclosed?
CVE-2026-45609 was first published in the National Vulnerability Database on May 18, 2026, with the most recent update on June 3, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-45609 actively exploited?
CVE-2026-45609 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 9.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-45609?
CVE-2026-45609 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-45609?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-45609, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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