3D Viewer for Nextcloud (1.7.9-3.3.1) - CraftedSignal Threat Feedhttps://feed.craftedsignal.io/products/3d-viewer-for-nextcloud-1.7.9-3.3.1/Trending threats, MITRE ATT&CK coverage, and detection metadata. Fed continuously.Hugoenhello@craftedsignal.iohello@craftedsignal.ioTue, 27 Oct 2026 18:04:46 +0000https://feed.craftedsignal.io/favicon-32x32.pngCraftedSignal Threat Feedhttps://feed.craftedsignal.io/3232https://feed.craftedsignal.io/favicon.svgNextcloud: 3D Viewer authentication bypass (CVE-2026-104189)https://feed.craftedsignal.io/briefs/2026-10-nextcloud-3d-viewer-auth-bypass/Tue, 27 Oct 2026 18:04:46 +0000hello@craftedsignal.iohttps://feed.craftedsignal.io/briefs/2026-10-nextcloud-3d-viewer-auth-bypass/The 3D Viewer for Nextcloud application contains an authentication bypass vulnerability that allows unauthenticated users to access password-protected 3D model files via a valid share token.Nextcloud 3D Viewer versions 1.7.9 through 3.3.1 contain an authentication bypass vulnerability (CVE-2026-104189) in the PublicFileController. The application fails to enforce share password requirements because the controller does not correctly implement OCP\AppFramework\PublicShareController, causing PublicShareMiddleware to skip authorization checks. Attackers with a known share token can access 3D files (such as STL, GLB/glTF, OBJ, STEP, and IFC) within password-protected links without providing the password. This issue is resolved in version 3.3.2.

Impact

Successful exploitation allows unauthorized access to and exfiltration of 3D model files protected by password-restricted share links. Only 3D file formats supported by the application are affected.

Recommendation

  • Upgrade the 3D Viewer for Nextcloud to version 3.3.2 or later immediately.
  • If upgrading is not immediately feasible, disable the 3D Viewer application using the command: occ app:disable threedviewer.
  • Avoid relying on password protection for public shares containing sensitive 3D model files until the patch is applied.
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