TI-2026-56989 Aliases CVE-2026-82651 GHSA-j8f5-rf5j-w7pm

SiYuan before v3.8.1 Missing Authorization via /history and /repo/diff

LOW 31CWE-200Published 2026-08-30 · Updated 2026-08-31

Key facts

Attack vector: Network
Privileges required: High
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: Information disclosure
Confidentiality · integrity · availability: High · None · None
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-200.

Summary

SiYuan before v3.8.1 does not apply the IsForbiddenAbsPath guard (introduced in GHSA-c8r8-95hg-mp34) to the /history/*path and /repo/diff/*path endpoints in kernel/server/serve.go. These routes require admin authentication but construct file paths independently, so an authenticated administrator can retrieve historical snapshots of sensitive files that the guard is meant to block, including data/.siyuan/publishAccess.json (plaintext publish-mode passwords) and files under data/templates/.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00477 41st percentileScored 2026-11-07

Fix Fixed siyuan (siyuan-note): 3.8.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
siyuan-note	siyuan	before 3.8.1	3.8.1	Patch available	CNA

siyuan Vendorsiyuan-note Affected before 3.8.1 Fixed in 3.8.1 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:a:b3log:siyuan::::::::	—	—	siyuan-note

cpe:2.3:a:b3log:siyuan:*:*:*:*:*:*:*:* Versions — — ·siyuan-note

Remediation

Fix · CNA siyuan (siyuan-note) Fixed in 3.8.1

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

Release · 2026-08-30
siyuan-note siyuan 3.8.1
6 records Highest priority Priority HIGH 2 HIGH, 1 MEDIUM, 3 LOW
Other records, highest priority first
- TI-2026-56991 SiYuan before v3.8.1 Stored XSS via confirmDialogPriority HIGH 75
- TI-2026-56987 SiYuan before 3.8.1 Local Privilege Escalation via Uncontrolled Search PathPriority HIGH 72
- TI-2026-56992 SiYuan before v3.8.1 Stored XSS via block namePriority MEDIUM 42
Show all 6 records →

Timeline

2026-10-02 Threatist record created from CVE-2026-82651
2026-10-03 Alias added: GHSA-j8f5-rf5j-w7pm

References

Advisory 1

GitHub Security Advisory (GHSA-3cm4-ccvw-6xr6)

TI-2026-48492 SiYuan before v3.7.3 SQL Injection via searchDocs CVSS 4.0CRITICAL 9.9
TI-2026-48491 SiYuan before v3.7.3 SQL Injection via searchEmbedBlock CVSS 4.0CRITICAL 9.9
TI-2026-48490 SiYuan before v3.7.3 SQL Injection via fullTextSearchAssetContent CVSS 4.0CRITICAL 9.9
TI-2026-47010 SiYuan before v3.7.2 Unauthenticated Administrator Takeover via MCP CVSS 4.0CRITICAL 10.0
TI-2026-26050 SiYuan has directory traversal within its publishing service CVSS 3.1CRITICAL 9.8
TI-2026-25256 SiYuan: Authorization Bypass Allows Arbitrary SQL Execution via Search API CVSS 3.1CRITICAL 9.8

See all 242 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences