What is the CVSS score of CVE-2026-23851?

CVE-2026-23851 has a CVSS 3.1 base score of 6.5 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N. EPSS exploitation probability: 0.0%.

Is there a public PoC exploit available for CVE-2026-23851?

Yes, a public proof-of-concept exploit is available for CVE-2026-23851. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2026-23851?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Review file handling controls.

Siyuan CVE-2026-23851

MEDIUM

Path Traversal (CWE-22)

2026-01-19 security-advisories@github.com

GHSA-94c7-g2fj-7682

Golang Siyuan Suse B3Log

6.5

CVSS 3.1 · GitHub Advisory

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Vulnerability Assessment

Weakness	CWE CWE-22 OWASP Top 10:2025 A01:2025 - Broken Access Control ASVS 5.0 V5 - File Handling Path canonicalization, traversal prevention MITRE ATT&CK 2 techniques across 2 tactics: Discovery, Collection The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Impact	CVSS 6.5 (MEDIUM). Attack vector: Network. Complexity: Low. Privileges required: Low. User interaction: None. Exploitation requires authentication. Public exploit/POC available.
Exploit ScenarioDerived	An attacker (requires authentication) could exploit this vulnerability to copy files from any location on the server's filesystem into the application's w.

This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).

Patch available 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

SiYuan knowledge management system versions before 3.5.4 allow authenticated users to copy arbitrary files from the server filesystem into the application workspace due to insufficient path validation in the /api/file/globalCopyFiles endpoint. An attacker with valid credentials can exploit this path traversal vulnerability to read sensitive files and escalate privileges within the application. Public exploit code exists for this medium-severity vulnerability, though a patch is available.

Earlier versions of this analysis (1)

v1 Mar 12, 2026 - 21:54 CVSS 6.5

SiYuan is a personal knowledge management system. Versions prior to 3.5.4 contain a logic vulnerability in the /api/file/globalCopyFiles endpoint. [CVSS 6.5 MEDIUM]

RemediationAI

A vendor patch is available — apply it immediately. Validate and sanitize file path inputs. Use allowlists. Restrict network access to the affected service where possible.

Affected Packages

go github.com/siyuan-note/siyuan/kernel fix: 0.0.0-20260118092521-f8f4b517077b

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in go

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

Classified as CWE-22 (Path Traversal). Affects Siyuan. SiYuan is a personal knowledge management system. Versions prior to 3.5.4 contain a logic vulnerability in the /api/file/globalCopyFiles endpoint. The function allows authenticated users to copy files from any location on the server's filesystem into the application's workspace without proper path validation. The vulnerability exists in the api/file.go source code. The function globalCopyFiles accepts a list of source paths (srcs) from the JSON request body. While the code checks if the source f

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

GitHub Advisory PRIMARY 6.5 MEDIUM

AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

SUSE MEDIUM

Primary rating from GitHub Advisory.

CVSS VectorGitHub Advisory

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Lifecycle Timeline

PoC Detected

Jan 30, 2026 - 15:12 vuln.today

Public exploit code

Patch released

Jan 30, 2026 - 15:12 nvd

Patch available

CVE Published

Jan 19, 2026 - 20:15 nvd

MEDIUM 6.5

DescriptionGitHub Advisory

SiYuan is a personal knowledge management system. Versions prior to 3.5.4 contain a logic vulnerability in the /api/file/globalCopyFiles endpoint. The function allows authenticated users to copy files from any location on the server's filesystem into the application's workspace without proper path validation. The vulnerability exists in the api/file.go source code. The function globalCopyFiles accepts a list of source paths (srcs) from the JSON request body. While the code checks if the source file exists using filelock.IsExist(src), it fails to validate whether the source path resides within the authorized workspace directory. Version 3.5.4 patches the issue.

Executive ViewAI

Why It Matters

Organizations using SiYuan should be aware of notable risk from CVE-2026-23851, a path traversal vulnerability rated CVSS 6.5. This could allow unauthorized file access. Proof-of-concept code is publicly available. A patch is available and should be applied during regular vulnerability management.

Business Impact: Moderate

Compensating Controls

Apply vendor patch. If patching is delayed: restrict file access via WAF, implement allowlists.

Threat Intelligence Overview

EPSS Score

0.0%

Top 88% exploitable

Exploit

POC

Public exploit code exists

Data Quality

4 sources

Confidence: Medium

NVD

CVE.org

EPSS Vendor

GitHub

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity MEDIUM

CISA KEV No

Public POC Yes

EPSS 0.0%

Patch available Yes

Active threat No

Deciding rule

MEDIUM severity (CVSS 4.0-6.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

Exploitation· derived

Poc

System Exposure· derived

Open

Automatable· derived

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +32

PoC: +20

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Affected Products (CPE)GitHub Advisory

cpe:2.3:a:b3log:siyuan:*:*:*:*:*:*:*:*

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CVE-2024-53505 CRITICAL Act Now POC

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CVE-2024-53504 CRITICAL Act Now POC

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CVE-2026-23852 CRITICAL Act Now POC

9.6 Jan 19

SiYuan personal knowledge management system prior to 3.5.4 has a stored XSS vulnerability (CVSS 9.6) that allows code ex

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Remote code execution in SiYuan note-taking application (before v3.6.1) allows any malicious Bazaar marketplace package

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Same weakness CWE-22 – Path Traversal

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CVE-2019-19781 CRITICAL POC

9.8

CVE-2020-5902 CRITICAL POC

9.8

CVE-2021-21972 CRITICAL POC

9.8

CVE-2021-40444 HIGH POC

8.8

CVE-2022-41352 CRITICAL POC

9.8

CVE-2021-27065 HIGH POC

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CVE-2019-11510 CRITICAL POC

10.0

Vendor StatusVendor

SUSE

Severity: Medium

Product	Status
openSUSE Leap 15.6	Fixed
SUSE Linux Enterprise Module for Package Hub 15 SP5	Fixed
SUSE Linux Enterprise Module for Package Hub 15 SP6	Fixed
openSUSE Leap 15.5	Fixed

References

Advisories & patches

PATCH https://github.com/siyuan-note/siyuan/commit/b2274baba2e11c8cf8901b0c5c871e5b27f1f6dd PATCH https://github.com/siyuan-note/siyuan/commit/f8f4b517077b92c90c0d7b51ac11be1b34b273ad PATCH https://github.com/siyuan-note/siyuan/issues/16860 ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:0403/

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GitHub PoC

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