EUVD-2026-70409
GHSA-gw65-q899-j639
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/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-accessible attack requires low-privilege authentication; no scope change; admin token recovery enables full confidentiality, integrity, and availability compromise of the SiYuan instance.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
4DescriptionCVE.org
SiYuan before v3.8.2 logs API tokens from query parameters in plaintext to an accessible log file when full-text search requests exceed timing thresholds. Authenticated attackers can read the log file via the getFile endpoint to recover admin API tokens and gain permanent administrative access.
AnalysisAI
SiYuan's full-text search logging mechanism writes admin API tokens in plaintext to an accessible log file when requests exceed internal timing thresholds, enabling authenticated low-privilege users to escalate to permanent administrative access. All self-hosted SiYuan instances before v3.8.2 are affected; because API tokens are passed as query parameters and the log file is retrievable via the built-in getFile endpoint, the privilege escalation path requires no additional exploitation steps beyond triggering a slow search and reading the file. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a valid low-privilege authenticated session on the target SiYuan instance (CVSS PR:L). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 8.7 (AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H) accurately reflects the threat model: the attack is network-reachable, requires no special configuration, and demands only a low-privilege account. … 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 | Upgrade SiYuan to v3.8.2 or later, which addresses the plaintext token logging behavior per the vendor security advisory at https://github.com/siyuan-note/siyuan/security/advisories/GHSA-3wvc-5754-gp67. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: inventory all SiYuan deployments and identify instances running versions before 3.8.2; review search logs for evidence of exploitation and revoke any compromised admin tokens immediately. …
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