What is the CVSS score of CVE-2026-23645?

CVE-2026-23645 has a CVSS 3.1 base score of 6.1 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N. EPSS exploitation probability: 0.0%.

Which versions of Siyuan are affected by CVE-2026-23645?

Organizations using SiYuan should be aware of moderate risk from CVE-2026-23645, a cross-site scripting vulnerability rated CVSS 6.1.. A patch is available.

Is there a public PoC exploit available for CVE-2026-23645?

Yes, a public proof-of-concept exploit is available for CVE-2026-23645. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2026-23645?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Verify Content-Security-Policy and output encoding.

Siyuan CVE-2026-23645

MEDIUM

Cross-site Scripting (XSS) (CWE-79)

2026-01-16 security-advisories@github.com

GHSA-pcjq-j3mq-jv5j

XSS Siyuan Suse

6.1

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

6.1 MEDIUM

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

SUSE

MEDIUM

qualitative

Primary rating from GitHub Advisory.

CVSS VectorGitHub Advisory

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:54 vuln.today

PoC Detected

Jan 30, 2026 - 19:32 vuln.today

Public exploit code

Patch released

Jan 30, 2026 - 19:32 nvd

Patch available

CVE Published

Jan 16, 2026 - 20:15 nvd

MEDIUM 6.1

DescriptionGitHub Advisory

SiYuan is self-hosted, open source personal knowledge management software. Prior to 3.5.4-dev2, a Stored Cross-Site Scripting (XSS) vulnerability exists in SiYuan Note. The application does not sanitize uploaded SVG files. If a user uploads and views a malicious SVG file (e.g., imported from an untrusted source), arbitrary JavaScript code is executed in the context of their authenticated session. This vulnerability is fixed in 3.5.4-dev2.

AnalysisAI

SiYuan prior to version 3.5.4-dev2 fails to sanitize SVG file uploads, allowing authenticated attackers to embed malicious JavaScript that executes when other users view the files. Public exploit code exists for this stored XSS vulnerability, which can compromise user sessions and access sensitive knowledge management data. …

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Vulnerability AssessmentAI

Risk Assessment	CVSS 6.1 (MEDIUM). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario	An attacker (requires authentication) could exploit this vulnerability to compromise the affected system.
Remediation	A vendor patch is available — apply it immediately. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. …

Threat intelligence, references, and detailed analysis are available after sign-in.

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

CVE-2026-23645 vulnerability details – vuln.today

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Siyuan CVE-2026-23645

Severity by source

CVSS VectorGitHub Advisory

Lifecycle Timeline

DescriptionGitHub Advisory

AnalysisAI

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Recommended ActionAI

Vendor StatusVendor

SUSE

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External POC / Exploit Code