EUVD-2026-68237
GHSA-j8f5-rf5j-w7pm
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network-reachable HTTP API, no complexity once authenticated; PR:H because admin credentials are required; confidentiality-only impact on sensitive credential files.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
3DescriptionCVE.org
SiYuan before v3.8.1 does not apply the IsForbiddenAbsPath guard (introduced in GHSA-c8r8-95hg-mp34) to the /history/*path and /repo/diff/*path endpoints in kernel/server/serve.go. These routes require admin authentication but construct file paths independently, so an authenticated administrator can retrieve historical snapshots of sensitive files that the guard is meant to block, including data/.siyuan/publishAccess.json (plaintext publish-mode passwords) and files under data/templates/.
AnalysisAI
Authenticated administrators in SiYuan before v3.8.1 can bypass the IsForbiddenAbsPath security guard - introduced to remediate GHSA-c8r8-95hg-mp34 - by targeting the /history/*path and /repo/diff/*path API endpoints, which construct file paths independently and were never covered by the guard. Exploitation enables retrieval of historical file snapshots including data/.siyuan/publishAccess.json, which stores plaintext publish-mode passwords, and files under data/templates/. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires valid SiYuan administrator credentials - the CVSS vector specifies PR:H, confirming high-privilege authentication is mandatory. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:H/UI:N with VC:H) yields a score of 6.9 (Medium), which accurately reflects the privilege barrier: exploitation requires administrator-level authentication, significantly narrowing the attacker pool to insiders, compromised admin credentials, or credential-reuse scenarios. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | The vendor-released patch is SiYuan v3.8.1, which applies the IsForbiddenAbsPath guard to the /history/*path and /repo/diff/*path endpoints. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-200 – Information Exposure
View allSame technique Information Disclosure
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External POC / Exploit Code
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