GHSA-w836-5gpm-7r93 is a medium-severity (CVSS 4.6) Cross-site Scripting (XSS) vulnerability in github.com/siyuan-note/siyuan/kernel. A fix is available for github.com/siyuan-note/siyuan/kernel — see the affected versions and patch details below.
SiYuan has a Reflected Cross-Site Scripting (XSS) via /api/icon/getDynamicIcon
Exploitation Status
Proof-of-concept exploit code exists
- CISA’s SSVC triage found public proof-of-concept exploit code for this CVE, though no confirmed active exploitation.
Exploitation and automatability from CISA’s SSVC triage for GHSA-w836-5gpm-7r93.
EPSS Exploitation Probability
EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.
How urgent is this, really
GHSA-w836-5gpm-7r93 plotted by exploitation likelihood (EPSS) against impact (CVSS). The shaded corner — EPSS 50%+ and CVSS 7.0+ — is where this CVE doesn't sit, though severity or exploitability alone can still warrant action.
Where this sits among everything scored
Of 377,636 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Real counts from FIRST.org, not a sample — log-scaled since the landscape is heavily right-skewed.
Real-World Exposure
github.com/siyuan-note/siyuan/kernelReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.
Description
Summary
Reflected XSS in /api/icon/getDynamicIcon due to unsanitized SVG input.
Details
The endpoint generates SVG images for text icons (type=8). The content query parameter is inserted directly into the SVG <text> tag without XML escaping. Since the response Content-Type is image/svg+xml, injecting unescaped tags allows breaking the XML structure and executing JavaScript.
PoC
Payload: test</text><script>alert(window.origin)</script><text>
-
Open any note and click Change Icon -> Dynamic (Text).
<img width="713" height="373" alt="image" src="https://github.com/user-attachments/assets/8a4f5ec4-81d6-46cb-8872-841cb2188ed8" /> -
Change color and paste the payload into the Custom field and click on this icon.
<img width="935" height="682" alt="image" src="https://github.com/user-attachments/assets/24d28fbd-a3ce-44f1-a5bb-2cc3f711faf5" /> -
Intercept and send the request or get path from devtools
<img width="1229" height="627" alt="image" src="https://github.com/user-attachments/assets/3cfb1d9a-5a23-476c-86cc-f9a7de6bbe32" />
- The JavaScript payload executes afted open URL. <img width="701" height="809" alt="image" src="https://github.com/user-attachments/assets/343ad67a-e236-466b-9ec9-e4f1dea4fd5e" />
Impact
Arbitrary JavaScript execution in the user's session context if the SVG is loaded directly. It also prevents using legitimate characters like < or > in icon text.
Note
Tested version: <img width="1368" height="699" alt="image" src="https://github.com/user-attachments/assets/a7466b8f-a88b-461d-8d9e-7178af7ab076" />
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐹Go | github.com/siyuan-note/siyuan/kernel | all versions | 0.0.0-20260118021606-5c0cc375b475go get github.com/siyuan-note/siyuan/kernel@v0.0.0-20260118021606-5c0cc375b475 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/siyuan-note/siyuan/kernel, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update github.com/siyuan-note/siyuan/kernel to 0.0.0-20260118021606-5c0cc375b475 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-w836-5gpm-7r93 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like GHSA-w836-5gpm-7r93 can be triaged on real exposure rather than presence alone.
Tailored to GHSA-w836-5gpm-7r93. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is GHSA-w836-5gpm-7r93 in your dependencies?
O3 Security finds GHSA-w836-5gpm-7r93 across Go dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.