CVE-2026-82651Public exploitNetwork attack vectorHinoki check available

Sensitive-file disclosure via unguarded history routes

Published Aug 30, 2026 · Updated Aug 30, 2026

Missing authorization in SiYuan 3.8.0 allows remote authenticated users to read sensitive historical files through two HTTP routes. The /history/*path and /repo/diff/*path handlers construct snapshot paths and serve files without applying the IsForbiddenAbsPath guard. Exploitation requires administrator authentication and an existing snapshot containing protected data; impact is read-only disclosure.

CVSS severity4.9
Medium
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Missing authorization in SiYuan 3.8.0 allows remote authenticated users to read sensitive historical files through two HTTP routes. The /history/*path and /repo/diff/*path handlers construct snapshot paths and serve files without applying the IsForbiddenAbsPath guard. Exploitation requires administrator authentication and an existing snapshot containing protected data; impact is read-only disclosure.

The record

CVE
CVE-2026-82651
Published
Aug 30, 2026
Updated
Aug 30, 2026
Vendor
SiYuan Note
Product
SiYuan
Classifications
CWE-862, CWE-200, T1005
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Aug 30, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 30, 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 <3.8.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

SiYuan Note · SiYuanversion=0 <3.8.1

Published CVSS scores

4.9GitHubCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-862Missing Authorization
CWE-200Exposure of Sensitive Information to an Unauthorized Actor
T1005Data from Local System

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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