CVE-2026-29183
MediumSiYuan: Unauthenticated Reflected XSS via SVG Injection in /api/icon/getDynamicIcon Endpoint
Published Mar 4, 2026 · Updated Aug 12, 2026 · Also known as GHSA-6865-qjcf-286f, GO-2026-4596
Key Facts
Routine patching- CVE-2026-29183 is a medium-severity vulnerability (CVSS 6.1 v3.1) affecting Siyuan (B3log), github.com/siyuan-note/siyuan/kernel (go).
- It is not listed in any known-exploited vulnerabilities catalog. No public exploit code is known.
- EPSS estimates a 0.7% probability of exploitation in the next 30 days.
- Fixed versions are available, including Siyuan 3.5.9, github.com/siyuan-note/siyuan/kernel 0.0.0-20260304034809-d68bd5a79391.
- Brandefense priority: routine patching, as no exploitation is known and its severity is moderate or low.
CVSS v3.1
6.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
EPSS (30-day exploit likelihood)
0.7%
Higher than 51.9% of all scored CVEs
Exploited in the wild
No known
Not in a known-exploited catalog
Public exploit code
None known
Get the full CVE-2026-29183 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
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.
Affected Products
3 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| SiyuanB3log | >= < 3.5.9 | 3.5.9 |
| github.com/siyuan-note/siyuan/kernelgo | See advisory | 0.0.0-20260304034809-d68bd5a79391 |
Patched Releases
Siyuan
3.5.9
github.com/siyuan-note/siyuan/kernel
0.0.0-20260304034809-d68bd5a79391
Timeline
Publicly disclosed
Mar 4, 2026
Last updated
Aug 12, 2026
Weakness Type
- CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
References
- advisoryGHSA advisory
- advisoryhttps://github.com/CVEProject/cvelistV5/tree/main/cves/2026/29xxx/CVE-2026-29183.json
- advisoryhttps://nvd.nist.gov/vuln/detail/CVE-2026-29183
- articlehttps://github.com/siyuan-note/siyuan/commit/d68bd5a79391742b3cb2e14d892bdd9997064927
- articlehttps://github.com/siyuan-note/siyuan/security/advisories/GHSA-6865-qjcf-286f
FAQ
Common Questions.
SiYuan is a personal knowledge management system.
Affected: Siyuan (B3log) versions >= < 3.5.9; github.com/siyuan-note/siyuan/kernel (go). The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including Siyuan 3.5.9, github.com/siyuan-note/siyuan/kernel 0.0.0-20260304034809-d68bd5a79391.
Brandefense priority: routine patching, as no exploitation is known and its severity is moderate or low.
Is CVE-2026-29183 Running On Your Attack Surface?
Brandefense maps vulnerabilities like this one to your internet-facing assets and tells you exactly where to patch.
Request A Demo