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TI-2026-21998 Aliases CVE-2026-27612GHSA-fm8c-6m29-rp6j

Repostat Vulnerable to Reflected Cross-Site Scripting (XSS) via repo prop in RepoCard

Priority MEDIUM 60CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Cross-site scripting
Confidentiality · integrity · availability
Low · Low · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-79.

Summary

Repostat is a React component to fetch and display GitHub repository info. Prior to version 1.0.1, 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. In 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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00234 14th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed repostat (denpiligrim): 1.0.1repostat (npm): 1.0.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
denpiligrimrepostatbefore 1.0.11.0.1Patch availableCNA
—repostat (npm)before 1.0.11.0.1Patch availableGHSA-fm8c-6m29-rp6j
  • repostat Vendordenpiligrim Affected before 1.0.1 Fixed in 1.0.1 Patch available CNA
  • repostat (npm) Vendor— Affected before 1.0.1 Fixed in 1.0.1 Patch available GHSA-fm8c-6m29-rp6j

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:denpiligrim:repostat:*:*:*:*:*:node.js:*:*before 1.0.1Vulnerabledenpiligrim
  • cpe:2.3:a:denpiligrim:repostat:*:*:*:*:*:node.js:*:* Versions before 1.0.1 Vulnerable ·denpiligrim

Remediation

  • Fix · CNA repostat (denpiligrim) Fixed in 1.0.1
  • Fix · GHSA-fm8c-6m29-rp6j repostat (npm) Fixed in 1.0.1 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-27612
  2. 2026-10-03 Alias added: GHSA-fm8c-6m29-rp6j
  3. 2026-11-03 CISA SSVC decision points changed
  4. 2026-11-03 Priority changed: LOW → MEDIUM

References

Sources