CVE-2026-67444

Hubleys: Stored XSS via unrestricted background-image upload, served with an attacker-chosen Content-Type and no CSP protection

Published Nov 13, 2026 CVSS 4.0 · 7.1 High EPSS n/a KEV · Not listed
Description
Hubleys is a dashboard for self-hosted services. Prior to version 0.5.2, any authenticated (non-admin) Hubleys user can upload a file with an arbitrary extension as their dashboard "background image," and the server will later serve that file back with a Content-Type derived straight from the attacker's chosen extension - so uploading an .html file gets it served as text/html. Because the endpoint that serves it returns a manually-constructed response rather than going through SvelteKit's normal page-rendering pipeline, the app's configured Content-Security-Policy never gets attached to it either, so a script embedded in the upload runs unrestricted. This issue has been patched in version 0.5.2.

Analysis

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Remediation

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Tracking

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Advisories

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History
Type Values Removed Values Added
Description Hubleys is a dashboard for self-hosted services. Prior to version 0.5.2, any authenticated (non-admin) Hubleys user can upload a file with an arbitrary extension as their dashboard "background image," and the server will later serve that file back with a Content-Type derived straight from the attacker's chosen extension - so uploading an .html file gets it served as text/html. Because the endpoint that serves it returns a manually-constructed response rather than going through SvelteKit's normal page-rendering pipeline, the app's configured Content-Security-Policy never gets attached to it either, so a script embedded in the upload runs unrestricted. This issue has been patched in version 0.5.2.
Title Hubleys: Stored XSS via unrestricted background-image upload, served with an attacker-chosen Content-Type and no CSP protection
Weaknesses CWE-434
CWE-79
References
Metrics cvssV4_0

{'score': 7.1, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N'}

Subscriptions

No data.

Weaknesses
  • CWE-434

    Unrestricted Upload of File with Dangerous Type

  • CWE-79

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

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Nov 13, 2026, 7:02 PM
Reserved
Jul 29, 2026, 3:07 PM
Status
Received
Published
Nov 13, 2026, 7:19 PM
Modified
Nov 13, 2026, 7:19 PM