CVE Explorer

CVE-2026-33252

The Go MCP SDK used Go's standard encoding/json. Prior to version 1.4.1, the Go SDK's Streamable HTTP transport accepted browser-generated cross-site `POST` requests without validating the `Origin` header and without requiring `Content-Type: application/json`. In deployments without Authorization, especially stateless or sessionless configurations, this allows an arbitrary website to send MCP requests to a local server and potentially trigger tool execution. Version 1.4.1 contains a patch for th

Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:b5ed3f605eae161505f370dd3ff905497c0641a1cf6c3fbf7d498f0043a19646

Known exploited

Not asserted

Disputed

Stale source

Conflicts

Affected products and versions

1 source assertion

{"product":"go-sdk","vendor":"modelcontextprotocol","versions":[{"status":"affected","version":"< 1.4.1"}]}

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:6f10ee2511a7aeb6cdfabd19572edf28b57a6c2fb57fe54b802d31c818e66aae · sha256:f366b922558ffe67… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion

{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":7.1,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:L","version":"3.1"},"metric_type":"cvssV3_1"}

cve_program_cvelist_v5cvss
urn:baitaphish:normalized-source-record:v2:6f10ee2511a7aeb6cdfabd19572edf28b57a6c2fb57fe54b802d31c818e66aae · sha256:f366b922558ffe67… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion

{"cweId":"CWE-352","description":"CWE-352: Cross-Site Request Forgery (CSRF)","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:6f10ee2511a7aeb6cdfabd19572edf28b57a6c2fb57fe54b802d31c818e66aae · sha256:f366b922558ffe67… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions

{"name":"https://github.com/modelcontextprotocol/go-sdk/commit/a433a831d6e5d5ac3b9e625a8095aa8eaa040dfc","tags":["x_refsource_MISC"],"url":"https://github.com/modelcontextprotocol/go-sdk/commit/a433a831d6e5d5ac3b9e625a8095aa8eaa040dfc"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:6f10ee2511a7aeb6cdfabd19572edf28b57a6c2fb57fe54b802d31c818e66aae · sha256:f366b922558ffe67… · /containers/cna/references/1

{"name":"https://github.com/modelcontextprotocol/go-sdk/security/advisories/GHSA-89xv-2j6f-qhc8","tags":["x_refsource_CONFIRM"],"url":"https://github.com/modelcontextprotocol/go-sdk/security/advisories/GHSA-89xv-2j6f-qhc8"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:6f10ee2511a7aeb6cdfabd19572edf28b57a6c2fb57fe54b802d31c818e66aae · sha256:f366b922558ffe67… · /containers/cna/references/0

Attribution and limitations

CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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