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01 Record

CVE-2026-34237

MCP Java SDK has a Hardcoded Wildcard CORS (Access-Control-Allow-Origin: *)

MediumPUBLISHEDCNA: GitHub_M
CNA base score6.1 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
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02 Description

MCP Java SDK has a Hardcoded Wildcard CORS (Access-Control-Allow-Origin: *)

03 Exploitation and scoring

Exploitation
Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
SSVC decision
  • ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
  • AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
  • Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
0.23% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 13.9% of scored records. A rank, not a probability.
NVD base score
6.1 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD analysis status
Modified. NVD last modified this record on 2026-07-24.
Red Hat severity
No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2026-03-31 15:40Z7 MO AGO
Last updated
2026-06-09 18:39Z4 MO AGO
Reserved
2026-03-26
Assigning CNA
GitHub_M
Record state
PUBLISHED
Severity
Medium (CVSS 6.1)
CNA CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weaknesses
  • CWE-942Permissive Cross-domain Security Policy with Untrusted DomainsVariant
Data version
5.2
Document digest
0488575445148146ab7612a640f401843673c326fb9a5acab521356e2bef0ca2

05 Affected products

VendorProductVersionsPlatforms
modelcontextprotocoljava-sdk>= 1.0.0, < 1.0.1, >= 1.1.0, < 1.1.1, < 0.18.3—

06 References