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CVE-2026-44588— SiYuan: URL-encoded title bypasses `escapeAriaLabel`, decoded by `decodeURIComponent` into a tooltip-XSS

Quick assessment

Affected
siyuan-note siyuan
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

SiYuan是SiYuan开源的一个个人知识管理系统。 SiYuan 3.7.0之前版本存在跨站脚本漏洞，该漏洞源于工具提示处理程序未正确转义aria-label属性，可能导致跨站脚本攻击，进而执行任意代码。

AI Predicted 9.8 Difficulty: Easy EPSS 0.51% · P41

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 1

VendorProduct Version RangeStatus
siyuan-note siyuan < 3.7.0 affected
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I. Basic Information for CVE-2026-44588

Vulnerability Information
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Vulnerability Title
SiYuan: URL-encoded title bypasses `escapeAriaLabel`, decoded by `decodeURIComponent` into a tooltip-XSS
Source: CVE Program / CVE List V5
Vulnerability Description
SiYuan is an open-source personal knowledge management system. Prior to 3.7.0, he tooltip mouseover handler in app/src/block/popover.ts reads aria-label via getAttribute and passes it through decodeURIComponent before assigning to messageElement.innerHTML in app/src/dialog/tooltip.ts:41. The encoder used at the producer side, escapeAriaLabel in app/src/util/escape.ts:19-25, only handles HTML special characters (", ', <, literal &lt;) — it leaves %XX URL-escapes untouched. So a doc title containing %3Cimg src=x onerror=...%3E round-trips through escapeAriaLabel and the HTML attribute layer unmodified. Then decodeURIComponent on the consumer side converts %3C to a literal < character (a real <, NOT a character reference). When that string is assigned to innerHTML, the HTML5 tokenizer enters TagOpenState on the literal <, parses the <img> element, and the onerror handler fires. Because the renderer runs with nodeIntegration: true, contextIsolation: false, webSecurity: false (app/electron/main.js:407-411), require('child_process') is reachable from the injected handler, escalating to arbitrary code execution.This vulnerability is fixed in 3.7.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
SiYuan 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
SiYuan是SiYuan开源的一个个人知识管理系统。 SiYuan 3.7.0之前版本存在跨站脚本漏洞，该漏洞源于工具提示处理程序未正确转义aria-label属性，可能导致跨站脚本攻击，进而执行任意代码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
siyuan-note siyuan < 3.7.0 -

II. Public POCs for CVE-2026-44588

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III. Intelligence Information for CVE-2026-44588

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Vendor Advisories for CVE-2026-44588 (1)

Same Patch Batch · siyuan-note · 2026-05-14 · 7 CVEs total

CVE-2026-45375 9.0 CRITICAL SiYuan: Bazaar marketplace renders unescaped package `name` and `version` metadata, allowi
CVE-2026-44586 8.3 HIGH SiYuan: Bazaar marketplace renders unescaped package author metadata, allowing XSS and Ele
CVE-2026-45147 4.3 MEDIUM SiYuan: Broken access control in SiYuan `/api/tag/getTag` — Reader role can mutate `Conf.T
CVE-2026-45148 4.3 MEDIUM SiYuan: Broken access control in SiYuan publish-mode Readers can enumerate metadata
CVE-2026-45371 SiYuan: SiYuan publish-mode Reader can mutate Conf and SQL index via 8 ungated APIs
CVE-2026-44670 SiYuan: Stored XSS via Attribute View name to Electron renderer RCE in SiYuan

IV. Related Vulnerabilities

Same product: siyuan
Same vendor: siyuan-note
Same weakness: CWE-79

V. Comments for CVE-2026-44588

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