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SiYuan could allow external attackers to compromise user accounts via marketplace plugins.

The SiYuan personal knowledge management system could allow external attackers to execute malicious code if a user views a compromised marketplace item. This could potentially expose sensitive notes and compromise the integrity of your knowledge base.

NVD published May 14, 2026 (14 hours ago)

External risk briefCRITICAL

CVE-2026-45375

Halo Surface Signal

1/ 5

This vulnerability is a client-side flaw within the marketplace UI of a personal knowledge management system. It is not an internet-facing service or network-accessible endpoint. Exploitation requires a user to manually navigate to and view malicious content within the local application interface, which does not provide a public attack surface.

Exposure facts

H – Horizon Alert

A security vulnerability exists within the SiYuan personal knowledge management system, specifically affecting how its community marketplace displays information about third-party packages. Because the system does not properly process certain metadata fields, it can inadvertently execute malicious code if a user simply views compromised items within the marketplace interface. This presents a potential security risk, as it could allow unauthorized actions to occur within the application environment.

A – Asset Exposure

The vulnerability affects the SiYuan personal knowledge management system, specifically within the Bazaar marketplace feature used to discover themes and plugins. If a user views a specially crafted package listing, it could allow the execution of unauthorized HTML code directly within their application’s interface. This could potentially compromise the confidentiality of sensitive notes or lead to unauthorized interaction with the local application controls, impacting the integrity of your stored knowledge base.

L – Live Threat

The available information for this issue does not indicate active exploitation or observed targeting by malicious actors at this time. There is no evidence of public exploit code or proof-of-concept activity currently associated with this vulnerability. While it is possible for unauthorized content to be processed if a user interacts with untrusted components in the community marketplace, there are no current signals suggesting broader threat activity.

O – Operational Fix

Please update your SiYuan installation to the latest available release to apply the necessary security improvements. This update addresses an identified vulnerability within the community marketplace component that could impact system integrity when viewing plugins or themes. We recommend prioritizing this update as part of your standard maintenance cycle to ensure your knowledge management system remains secure.

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