CVE-2026-31807Public exploitNetwork attack vector

Reflected XSS via unchecked SVG animation elements

Published Mar 10, 2026 · Updated Mar 10, 2026

Reflected XSS in SiYuan before 3.5.10 allows remote attackers to execute JavaScript through the unauthenticated dynamic-icon endpoint. SanitizeSVG passes animate and set elements whose runtime attribute changes introduce JavaScript URLs or event handlers after its static checks finish. A victim must open the crafted SVG URL and interact with its rendered content, after which script runs in the SiYuan origin and can read or modify notes through the victim's session.

CVSS severity6.4
Medium
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Reflected XSS in SiYuan before 3.5.10 allows remote attackers to execute JavaScript through the unauthenticated dynamic-icon endpoint. SanitizeSVG passes animate and set elements whose runtime attribute changes introduce JavaScript URLs or event handlers after its static checks finish. A victim must open the crafted SVG URL and interact with its rendered content, after which script runs in the SiYuan origin and can read or modify notes through the victim's session.

The record

CVE
CVE-2026-31807
Published
Mar 10, 2026
Updated
Mar 10, 2026
Vendor
SiYuan Note
Product
SiYuan
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 3.5.10

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

SiYuan Note · SiYuanversion=< 3.5.10

Published CVSS scores

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
6.4GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo