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01 Record

CVE-2026-104850

MCP TypeScript SDK: OAuth client could send credentials to an authorization server chosen by the MCP server

HighPUBLISHEDCNA: GitHub_M
CNA base score7.5 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
View raw JSON

02 Description

MCP TypeScript SDK: OAuth client could send credentials to an authorization server chosen by the MCP server

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.
  • AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
  • 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
0.22% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 13.1% of scored records. A rank, not a probability.
NVD base score
7.5 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD analysis status
Awaiting Analysis. NVD last modified this record on 2026-10-06.
Red Hat severity
Important. Red Hat's rating for its own products, not a CVSS rating.

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
2026-10-06 16:08Z22 DAYS AGO
Last updated
2026-10-06 16:28Z22 DAYS AGO
Reserved
2026-10-02
Assigning CNA
GitHub_M
Record state
PUBLISHED
Severity
High (CVSS 7.5)
CNA CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weaknesses
  • CWE-345Insufficient Verification of Data AuthenticityClass
  • CWE-522Insufficiently Protected CredentialsClass
  • CWE-941Incorrectly Specified Destination in a Communication ChannelBase
Data version
5.2
Document digest
c6a03b016a1ec59a536c3a856f74d03bb3fd97d9843929e2aa4b4f22aff1a7a9

05 Affected products

VendorProductVersionsPlatforms
modelcontextprotocoltypescript-sdk>= 1.12.0, < 1.31.0, >= 2.0.0, < 2.2.0—

06 References