CVE-2026-73046Public exploitNetwork attack vectorHinoki check available

Admin access via unthrottled Basic Auth guesses

Published Aug 15, 2026 · Updated Aug 15, 2026

Improper authentication-attempt restriction in SiYuan before 3.7.4 allows remote attackers to gain administrator access via HTTP Basic Auth. The CheckAuth() Basic Authentication branch compares the workspace access code without consulting NeedCaptcha() or incrementing WrongAuthCount. A network-reachable kernel with an access code is exposed to unlimited guesses; a successful guess grants file, query, export, plugin, and process privileges.

CVSS severity9.8
Critical
EPSS probability0.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Improper authentication-attempt restriction in SiYuan before 3.7.4 allows remote attackers to gain administrator access via HTTP Basic Auth. The CheckAuth() Basic Authentication branch compares the workspace access code without consulting NeedCaptcha() or incrementing WrongAuthCount. A network-reachable kernel with an access code is exposed to unlimited guesses; a successful guess grants file, query, export, plugin, and process privileges.

The record

CVE
CVE-2026-73046
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
SiYuan Note
Product
SiYuan
Classifications
CWE-307, CWE-208, T1110
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <3.7.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

SiYuan Note · SiYuanversion=0 <3.7.4

Published CVSS scores

9.3VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
9.8VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-307Improper Restriction of Excessive Authentication Attempts
CWE-208Observable Timing Discrepancy
T1110Brute Force

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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