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EUVD-2026-278418

2026-10-05T22:01:30.229380+00:00

EUVD-2026-278418

fkie_cve-2026-34585

2026-10-05T22:01:30.229417+00:00

SiYuan is a personal knowledge management system. Prior to version 3.6.2, a vulnerability allows crafted block attribute values to bypass server-side attribute escaping when an HTML entity is mixed with raw special characters. An attacker can embed a malicious IAL value inside a .sy document, package it as a .sy.zip, and have the victim import it through the normal Import -> SiYuan .sy.zip workflow. Once the note is opened, the malicious attribute breaks out of its original HTML context and injects an event handler, resulting in stored XSS. In the Electron desktop client, this XSS reaches remote code execution because injected JavaScript runs with access to Node/Electron APIs. This issue has been patched in version 3.6.2.

GHSA-ff66-236v-p4fg — SiYuan Desktop: Stored XSS in imported .sy.zip content leads to arbitrary command execution

2026-10-05T22:01:30.229454+00:00

Affected: Go: github.com/siyuan-note/siyuan/kernel

### Summary A vulnerability allows crafted block attribute values to bypass server-side attribute escaping when an HTML entity is mixed with raw special characters. An attacker can embed a malicious IAL value inside a `.sy` document, package it as a `.sy.zip`, and have the victim import it through the normal `Import -> SiYuan .sy.zip` workflow. Once the note is opened, the malicious attribute breaks out of its original HTML context and injects an event handler, resulting in stored XSS. In the Electron desktop client, this XSS reaches remote code execution because injected JavaScript runs with access to Node/Electron APIs.

### Details The issue is caused by a logic regression in `escapeNodeAttributeValues` in `kernel/filesys/tree.go`. Previously, the escaping logic converted `node.KramdownIAL` with `parse.IAL2Map(...)` before deciding whether a value needed escaping. That conversion unescaped existing entities first, so mixed values such as: ``` &" onmouseenter="alert('IAL-XSS') ``` were still recognized as unsafe and escaped correctly. The logic changed to inspect raw `KramdownIAL` values directly. The new `needsEscapeForValue` implementation returns `false` as soon as it sees any known entity such as `&`, `"`, `<`, or `>`. This means a value containing both an entity and an unescaped raw quote bypasses escaping entirely.

That bypass becomes exploitable because the renderer later inserts block IAL values directly into HTML attributes. A payload like: ```…