SiYuan is a personal knowledge management system. Prior to 3.5.10, SiYuan's SVG sanitizer (SanitizeSVG) blocks dangerous elements (<script>, <iframe>, <foreignobject>) and removes on* event handlers and javascript: in href attributes. However, it does NOT block SVG animation elements (<animate>, <set>) which can dynamically set attributes to dangerous values at runtime, bypassing the static sanitization. This allows an attacker to inject executable JavaScript into the unauthenticated /api/icon/getDynamicIcon endpoint (type=8), creating a reflected XSS. This is a bypass of the fix for CVE-2026-29183 (fixed in v3.5.9). This vulnerability is fixed in v3.5.10.
Metrics
Affected Vendors & Products
References
History
Wed, 11 Mar 2026 20:30:00 +0000
| Type | Values Removed | Values Added |
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| First Time appeared |
B3log
B3log siyuan |
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| CPEs | cpe:2.3:a:b3log:siyuan:*:*:*:*:*:*:*:* | |
| Vendors & Products |
B3log
B3log siyuan |
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| Metrics |
cvssV3_1
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Wed, 11 Mar 2026 16:15:00 +0000
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| Metrics |
ssvc
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Wed, 11 Mar 2026 12:00:00 +0000
| Type | Values Removed | Values Added |
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| First Time appeared |
Siyuan
Siyuan siyuan |
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| Vendors & Products |
Siyuan
Siyuan siyuan |
Tue, 10 Mar 2026 21:15:00 +0000
| Type | Values Removed | Values Added |
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| Description | SiYuan is a personal knowledge management system. Prior to 3.5.10, SiYuan's SVG sanitizer (SanitizeSVG) blocks dangerous elements (<script>, <iframe>, <foreignobject>) and removes on* event handlers and javascript: in href attributes. However, it does NOT block SVG animation elements (<animate>, <set>) which can dynamically set attributes to dangerous values at runtime, bypassing the static sanitization. This allows an attacker to inject executable JavaScript into the unauthenticated /api/icon/getDynamicIcon endpoint (type=8), creating a reflected XSS. This is a bypass of the fix for CVE-2026-29183 (fixed in v3.5.9). This vulnerability is fixed in v3.5.10. | |
| Title | SiYuan has a SVG Sanitizer Bypass via `<animate>` Element — Unauthenticated XSS | |
| Weaknesses | CWE-79 | |
| References |
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| Metrics |
cvssV4_0
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Status: PUBLISHED
Assigner: GitHub_M
Published: 2026-03-10T20:56:57.138Z
Updated: 2026-03-11T16:00:25.996Z
Reserved: 2026-03-09T16:33:42.913Z
Link: CVE-2026-31807
Updated: 2026-03-11T15:53:41.491Z
Status : Analyzed
Published: 2026-03-10T21:16:50.023
Modified: 2026-03-11T20:16:28.493
Link: CVE-2026-31807
No data.