SiYuan up to 3.5.4 Markdown cross site scripting

CVSS Meta Temp Score
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CTI Interest Score
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4.5$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as problematic, was found in SiYuan up to 3.5.4. Affected by this issue is some unknown functionality of the component Markdown Handler. Executing a manipulation can lead to cross site scripting. This vulnerability is tracked as CVE-2026-25647. The attack can be launched remotely. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in SiYuan up to 3.5.4. It has been declared as problematic. This vulnerability affects some unknown functionality of the component Markdown Handler. The manipulation with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. CVE summarizes:

Lute is a structured Markdown engine supporting Go and JavaScript. Lute 1.7.6 and earlier (as used in SiYuan before) has a Stored Cross-Site Scripting (XSS) vulnerability in the Markdown rendering engine. An attacker can inject malicious JavaScript into a Markdown text/note. When another user clicks the rendered content, the script executes in the context of their session.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-25647 since 02/04/2026. The exploitation appears to be easy. The attack can be initiated remotely. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1059.007.

Upgrading to version 3.5.5 eliminates this vulnerability. Applying the patch 0118e218916cf0cc7df639b50ce74e0c6c3d1868 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.5
VulDB Meta Temp Score: 4.5

VulDB Base Score: 3.5
VulDB Temp Score: 3.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 5.4
NVD Vector: 🔒

CNA Base Score: 4.6
CNA Vector (GitHub_M): 🔒

CVSSv2info

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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Cross site scripting
CWE: CWE-79 / CWE-94 / CWE-74
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: SiYuan 3.5.5
Patch: 0118e218916cf0cc7df639b50ce74e0c6c3d1868

Timelineinfo

02/04/2026 CVE reserved
02/06/2026 +2 days Advisory disclosed
02/06/2026 +0 days VulDB entry created
02/26/2026 +20 days VulDB entry last update

Sourcesinfo

Advisory: GHSA-rw25-98wq-76qv
Status: Confirmed

CVE: CVE-2026-25647 (🔒)
GCVE (CVE): GCVE-0-2026-25647
GCVE (VulDB): GCVE-100-344752

Entryinfo

Created: 02/06/2026 21:38
Updated: 02/26/2026 13:28
Changes: 02/06/2026 21:38 (66), 02/26/2026 13:28 (11)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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