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CVE-2026-29183

SiYuan: Unauthenticated reflected SVG XSS in `/api/icon/getDynamicIcon` (`type=8`) enables arbitrary JavaScript execution

Published: Mar 6, 2026Updated: Mar 6, 2026 Sources: CVE List NVD GHSACWE-79
NVD MITRE
9.3CVSSCRITICAL
EPSS Score
0.6%
Top 54.8%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Am I actually vulnerable?1 Nuclei template available — see how to check your systems. How to verify

Description

SiYuan is a personal knowledge management system. Prior to version 3.5.9, an unauthenticated reflected XSS vulnerability exists in the dynamic icon API endpoint "GET /api/icon/getDynamicIcon" when type=8, attacker-controlled content is embedded into SVG output without escaping. Because the endpoint is unauthenticated and returns image/svg+xml, a crafted URL can inject executable SVG/HTML event handlers (for example onerror) and run JavaScript in the SiYuan web origin. This can be chained to perform authenticated API actions and exfiltrate sensitive data when a logged-in user opens the malicious link. This issue has been patched in version 3.5.9.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:RS:CC:HI:HA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:CScope
Changed
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:NAvailability
None
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Weaknesses

CWE-79

Affected Products

github.com/siyuan-note/siyuan/kernelGoOSS Libraries
siyuansiyuan-note
gopackage-ecosystemOSS Libraries

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

2 techniques
Execution
Initial Access
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References

https://github.com/siyuan-note/siyuan/security/advisories/GHSA-6865-qjcf-286f
github.com
https://nvd.nist.gov/vuln/detail/CVE-2026-29183
nvd.nist.gov
https://github.com/siyuan-note/siyuan/commit/d68bd5a79391742b3cb2e14d892bdd9997064927
github.com
and 1 more references View all →

Timeline

Published
Mar 6, 2026
Last Updated
Mar 6, 2026

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