GHSA-qwj6-q94f-8425
MEDIUMGHSA-qwj6-q94f-8425 is a medium-severity (CVSS 6.3) Cross-site Scripting (XSS) vulnerability in mathlive. O3 Security confirms whether GHSA-qwj6-q94f-8425 is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
MathLive's Lack of Escaping of HTML allows for XSS
Blast Radius
Weekly download volume for affected packages — a proxy for how broadly this vulnerability is deployed.
mathlivenpmDescription
Summary
Despite normal text rendering as LaTeX expressions, preventing XSS, the library also provides users with commands which may modify HTML, such as the \htmlData command, and the lack of escaping leads to XSS.
Details
Overall in the code, other than in the test folder, no functions escaping HTML can be seen.
PoC
- Go to https://cortexjs.io/mathlive/demo/
- Paste either
\htmlData{><img/onerror=alert(1)"src=}{}or\htmlData{x=" ><img/onerror=alert(1) src>}{}in the LaTeX textarea.
Impact
MathLive users who render untrusted mathematical expressions could encounter malicious input using \htmlData that runs arbitrary JavaScript, or generate invalid HTML.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 📦npm | mathlive | all versions | 0.104.0 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for mathlive. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.
Fix
Update mathlive to 0.104.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-qwj6-q94f-8425 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 pinpoints whether GHSA-qwj6-q94f-8425 is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.
Tailored to GHSA-qwj6-q94f-8425. 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-qwj6-q94f-8425 in your dependencies?
O3 detects GHSA-qwj6-q94f-8425 across npm dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.