CVE-2026-73047Public exploit

Local environment disclosure via unrestricted template functions

Published Aug 15, 2026 · Updated Aug 15, 2026

Server-side template injection in SiYuan 3.7.0-beta.1 through 3.7.3 allows local users to read process environment variables. kernel/av/calc_template.go builds attribute-view Template calculations with Sprig's full TxtFuncMap, leaving env, expandenv, and getHostByName callable. Any local OS account can access the unauthenticated loopback kernel, expose the SiYuan process's environment, and initiate DNS lookups from its network position.

CVSS severity8.6
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Server-side template injection in SiYuan 3.7.0-beta.1 through 3.7.3 allows local users to read process environment variables. kernel/av/calc_template.go builds attribute-view Template calculations with Sprig's full TxtFuncMap, leaving env, expandenv, and getHostByName callable. Any local OS account can access the unauthenticated loopback kernel, expose the SiYuan process's environment, and initiate DNS lookups from its network position.

The record

CVE
CVE-2026-73047
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
SiYuan Note
Product
SiYuan
Classifications
CWE-1336, CWE-918, CWE-200, T1552
Attack vector
local
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

Compare your product and version with the public record. A matching version still requires validation against your environment.

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 vectorlocal
Required privilegesunauthenticated

What is affected?

SiYuan Note · SiYuanversion=0 <3.7.4

Published CVSS scores

6.2VulnCheckCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
8.6VulnCheckCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA: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.

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)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-1336Improper Neutralization of Special Elements Used in a Template Engine
CWE-918Server-Side Request Forgery (SSRF)
CWE-200Exposure of Sensitive Information to an Unauthorized Actor
T1552Unsecured Credentials

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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