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

Quick assessment

Affected

maz1987in 3Dviewer-Nextcloud

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Nextcloud 的 3D Viewer 是一款功能全面的 3D 模型查看器应用，支持多种 3D 文件格式。在版本 1.7.9 至 3.3.1 中，该应用的公开文件端点未执行分享授权检查。任何知晓分享令牌（share token）的用户，即使该链接分享设置了密码保护，也能读取共享文件的内容。具体原因如下：继承自，并将其路由标记为。 Nextcloud 仅通过强制实施分享密码验证，而该中间件会对非实例的控制器提前返回，导致密码、有效期及分享类型检查均未在这些路由上执行。进一步加剧了问题，它将任何通过

CVSS 7.5 · High Updated Oct 27, 2026

Possible ATT&CK Techniques 3 AI

T1078.004 · Cloud Accounts T1038 T1190 · Exploit Public-Facing Application

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Vulnerability Information

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Vulnerability Title

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

Source: CVE Program / CVE List V5

Vulnerability 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.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Source: CVE Program / CVE List V5

Vulnerability Type

关键功能的认证机制缺失

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
maz1987in	3Dviewer-Nextcloud	>= 1.7.9, < 3.3.2	-

II. Public POCs for CVE-2026-104189

#	POC Description	Source Link	Shenlong Link

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III. Intelligence Information for CVE-2026-104189

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Other References for CVE-2026-104189 (4)

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

https://www.cve.org/CVERecord?id=CVE-2026-104189

IV. Related Vulnerabilities

Same weakness: CWE-306