CVE-2026-27612 is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) vulnerability in repostat. A fix is available for repostat — see the affected versions and patch details below.
Repostat Vulnerable to Reflected Cross-Site Scripting (XSS) via repo prop in RepoCard
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 CVE-2026-27612.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
Where this sits among everything scored
Real-World Exposure
How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.
repostatnpmDescription
Impact
The RepoCard component is vulnerable to Reflected Cross-Site Scripting (XSS). The vulnerability occurs because the component uses React's dangerouslySetInnerHTML to render the repository name (repo prop) during the loading state without any sanitization.
If a developer using this package passes unvalidated user input directly into the repo prop (for example, reading it from a URL query parameter), an attacker can execute arbitrary JavaScript in the context of the user's browser.
Proof of Concept
import { RepoCard } from 'repostat';
function App() {
const params = new URLSearchParams(window.location.search);
const maliciousRepo = params.get('repo') || 'facebook/react';
return <RepoCard repo={maliciousRepo} token="YOUR_TOKEN" />;
}
Remediation
Update to version 1.0.1. The use of dangerouslySetInnerHTML has been removed, and the repo prop is now safely rendered using standard React JSX data binding, which automatically escapes HTML entities.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 📦npm | repostat | all versions | 1.0.1npm install repostat@1.0.1 |
Affected Products
repostatdenpiligrimDetection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for repostat, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update repostat to 1.0.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-27612 is resolved across your whole dependency graph.
Workarounds
Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.
Frequently Asked Questions
Is CVE-2026-27612 in your dependencies?
Find it across npm, including transitive dependencies.