EUVD-2026-60087
GHSA-r2rg-wg48-xwhx
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/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-accessible Basic Auth endpoint with no lockout; PR:N as no credentials needed to attempt guessing; only confidentiality of published notes is impacted.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/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
Lifecycle Timeline
3DescriptionCVE.org
SiYuan versions before 3.7.4 contain an unthrottled brute-force vulnerability in the Publish Service Basic Auth implementation (PublishServiceTransport.RoundTrip() in kernel/server/proxy/publish.go). The Publish Service runs on a separate, unauthenticated-by-default listener (default TCP port 6808) and gates named publish-viewer accounts (Conf.Publish.Auth.Accounts) with Basic Auth that has no rate limiting, per-account lockout, or backoff. Unauthenticated remote attackers can submit unlimited password guesses against named accounts to gain access to published notes/notebooks.
AnalysisAI
Unthrottled brute-force against SiYuan's Publish Service Basic Auth allows remote unauthenticated attackers to enumerate passwords against named publish-viewer accounts and gain read access to published notes and notebooks. All SiYuan releases before 3.7.4 are affected wherever the Publish Service is enabled and network-accessible on its default TCP port 6808. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The SiYuan Publish Service must be explicitly enabled in the application configuration and the secondary listener must be reachable by the attacker on TCP port 6808 (or a custom configured port). … 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:N/UI:N/VC:H/VI:N/VA:N) accurately reflects the ease of remote exploitation and the high confidentiality impact against published content. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker scans the internet for hosts with TCP port 6808 open, identifies a SiYuan Publish Service banner or HTTP response, and uses a tool such as Hydra or ffuf to submit rapid HTTP Basic Auth requests with a common-password wordlist against a guessed or enumerated account name such as 'viewer' or 'guest'. Because the server imposes no rate limit and never locks out the account, a 10,000-entry wordlist can be exhausted in seconds over a broadband connection, and if the account password appears in the list, the attacker immediately obtains authenticated read access to all published notes and notebooks on that instance. … |
| Remediation | Upgrade to SiYuan 3.7.4 or later, the vendor-confirmed fixed release per the GitHub Security Advisory GHSA-phg7-xcr4-q5wg at https://github.com/siyuan-note/siyuan/security/advisories/GHSA-phg7-xcr4-q5wg. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, immediately restrict TCP port 6808 network access to internal networks only or disable Publish Service entirely if not operationally critical. …
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