---
title: "CVE-2026-87814: SiYuan - Stored XSS"
description: "SiYuan < 3.8.2 contains a stored cross-site scripting vulnerability caused by failure to escape indexed asset content in the search asset preview feature, letting attackers execute JavaScript in the SiYuan origin, exploit requires attacker to place crafted text assets in a workspace."
url: https://panop.io/threat-heartbeat/CVE-2026-87814/
---

# CVE-2026-87814 SiYuan - Stored XSS

SiYuan < 3.8.2 contains a stored cross-site scripting vulnerability caused by failure to escape indexed asset content in the search asset preview feature, letting attackers execute JavaScript in the SiYuan origin, exploit requires attacker to place crafted text assets in a workspace.

CVSS base score 7.3 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.37% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-87814)

## Details

Type

Stored XSS

Impact

Stored XSS

CVSS vector

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

Published

9 September 2026

Updated

15 October 2026

Weakness

[CWE-79](https://cwe.mitre.org/data/definitions/79.html)

## Vendor fix

Update to version 3.8.2 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-87814](https://nvd.nist.gov/vuln/detail/CVE-2026-87814)
- [https://www.vulncheck.com/advisories/siyuan-before-3.8.2-stored-xss-via-asset-preview](https://www.vulncheck.com/advisories/siyuan-before-3.8.2-stored-xss-via-asset-preview)
- [https://github.com/siyuan-note/siyuan/security/advisories/GHSA-64gp-333q-mq6j](https://github.com/siyuan-note/siyuan/security/advisories/GHSA-64gp-333q-mq6j)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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