CVE-2026-72794Public exploitNetwork attack vectorHinoki check available

Session-cookie forgery via exposed signing key

Published Aug 12, 2026 · Updated Aug 12, 2026

Credential disclosure in SiYuan before 3.7.4 allows remote attackers to obtain the session-cookie signing key through publish mode. The /api/system/getConf handler permits publish readers and, when publish authentication is disabled, anonymous callers, while its masking chain leaves Conf.CookieKey in the response. Possession of the key enables accepted cookie forgery; privileged impersonation additionally requires no access-auth code or matching session data.

CVSS severity9.2
Critical
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Credential disclosure in SiYuan before 3.7.4 allows remote attackers to obtain the session-cookie signing key through publish mode. The /api/system/getConf handler permits publish readers and, when publish authentication is disabled, anonymous callers, while its masking chain leaves Conf.CookieKey in the response. Possession of the key enables accepted cookie forgery; privileged impersonation additionally requires no access-auth code or matching session data.

The record

CVE
CVE-2026-72794
Published
Aug 12, 2026
Updated
Aug 12, 2026
Vendor
SiYuan Note
Product
SiYuan
Classifications
CWE-522, T1606.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 12, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 12, 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

9.2VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N
8.6GitHub Security AdvisoryCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

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.

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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-522Insufficiently Protected Credentials
T1606.001Forge Web Credentials: Web Cookies

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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