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Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVE-2026-45627

Low
0/10

Summary

The unauthenticated `GET /api/app-images/logo` endpoint reflects a user-supplied `color` query parameter into the body of an SVG document via `strings.ReplaceAll` with no escaping. The substitution lands inside a `<style>` element of the embedded `logo.svg`, allowing an attacker to close the style block and inject executable `<script>` content. Because the response is served as `image/svg+xml` and Arcane sets no Content-Security-Policy or `X-Content-Type-Options` headers, navigating a logged-in admin victim to a crafted URL executes attacker-controlled JavaScript in Arcane's origin and rides the victim's HttpOnly JWT cookie to fully compromise the admin account. The affected versions are prior to 1.19.0.

  • LOW
  • NETWORK
  • LOW
  • CHANGED
  • REQUIRED
  • NONE
  • HIGH
  • NONE

CWE-79 - Cross Site Scripting

Cross-Site Scripting, commonly referred to as XSS, is the most dominant class of vulnerabilities. It allows an attacker to inject malicious code into a pregnable web application and victimize its users. The exploitation of such a weakness can cause severe issues such as account takeover, and sensitive data exfiltration. Because of the prevalence of XSS vulnerabilities and their high rate of exploitation, it has remained in the OWASP top 10 vulnerabilities for years.

References

Advisory Timeline

  • Published