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CVE-2026-66012

SiYuan before v3.7.2 contains a missing authorization vulnerability in the POST /mcp kernel endpoint, which is gated only by a general auth check (model.CheckAuth) with no admin-role or read-only enforcement. This exposes 31 MCP tools, including a file tool with list/read/write/delete/rename/copy actions across the entire workspace. When the Publish server is enabled in anonymous mode (Conf.Publish.Enable=true and Conf.Publish.Auth.Enable=false), the Publish reverse proxy attaches an anonymous R
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:781b7dba4a7052434e75430e9a314e65903ae5e5f36bcd35a972970cb5f8e4e4
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cvss · 2 assertions

{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":10,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:524b3a2c8ed25fbd7452f635f8a0e58ed75e97dea86fa30cc7bb5ede3be1083a · sha256:44d61a7b583c340d… · /containers/cna/metrics/1/cvssV3_1

{"metric":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":10,"baseSeverity":"CRITICAL","privilegesRequired":"NONE","subAvailabilityImpact":"HIGH","subConfidentialityImpact":"HIGH","subIntegrityImpact":"HIGH","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"HIGH"},"metric_type":"cvssV4_0"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:524b3a2c8ed25fbd7452f635f8a0e58ed75e97dea86fa30cc7bb5ede3be1083a · sha256:44d61a7b583c340d… · /containers/cna/metrics/0/cvssV4_0

Affected products and versions

1 source assertion
{"defaultStatus":"unaffected","packageURL":"pkg:npm/github.com/siyuan-note/siyuan","product":"siyuan","vendor":"siyuan-note","versions":[{"lessThan":"3.7.2","status":"affected","version":"0","versionType":"semver"},{"status":"unaffected","version":"3.7.2","versionType":"semver"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:524b3a2c8ed25fbd7452f635f8a0e58ed75e97dea86fa30cc7bb5ede3be1083a · sha256:44d61a7b583c340d… · /containers/cna/affected/0

Provider-owned CVSS observations

2 source assertions
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":10,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:524b3a2c8ed25fbd7452f635f8a0e58ed75e97dea86fa30cc7bb5ede3be1083a · sha256:44d61a7b583c340d… · /containers/cna/metrics/1/cvssV3_1
{"metric":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":10,"baseSeverity":"CRITICAL","privilegesRequired":"NONE","subAvailabilityImpact":"HIGH","subConfidentialityImpact":"HIGH","subIntegrityImpact":"HIGH","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"HIGH"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:524b3a2c8ed25fbd7452f635f8a0e58ed75e97dea86fa30cc7bb5ede3be1083a · sha256:44d61a7b583c340d… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-862","description":"Missing Authorization","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:524b3a2c8ed25fbd7452f635f8a0e58ed75e97dea86fa30cc7bb5ede3be1083a · sha256:44d61a7b583c340d… · /containers/cna/problemTypes/0/descriptions/0

Source references

4 source assertions
{"name":"https://github.com/siyuan-note/siyuan/commit/c72ca4cd09019e5f64afdee8f8c6ec5ef34858db","tags":["patch"],"url":"https://github.com/siyuan-note/siyuan/commit/c72ca4cd09019e5f64afdee8f8c6ec5ef34858db"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:524b3a2c8ed25fbd7452f635f8a0e58ed75e97dea86fa30cc7bb5ede3be1083a · sha256:44d61a7b583c340d… · /containers/cna/references/1
{"tags":["exploit"],"url":"https://github.com/siyuan-note/siyuan/security/advisories/GHSA-cvhv-7xhj-xjp8"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:524b3a2c8ed25fbd7452f635f8a0e58ed75e97dea86fa30cc7bb5ede3be1083a · sha256:44d61a7b583c340d… · /containers/adp/0/references/0
{"name":"GitHub Security Advisory (GHSA-cvhv-7xhj-xjp8)","tags":["vendor-advisory"],"url":"https://github.com/siyuan-note/siyuan/security/advisories/GHSA-cvhv-7xhj-xjp8"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:524b3a2c8ed25fbd7452f635f8a0e58ed75e97dea86fa30cc7bb5ede3be1083a · sha256:44d61a7b583c340d… · /containers/cna/references/0
{"name":"VulnCheck Advisory: SiYuan before v3.7.2 Unauthenticated Administrator Takeover via MCP","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/siyuan-before-unauthenticated-administrator-takeover-via-mcp"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:524b3a2c8ed25fbd7452f635f8a0e58ed75e97dea86fa30cc7bb5ede3be1083a · sha256:44d61a7b583c340d… · /containers/cna/references/2

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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