---
title: "CVE-2026-104189: Nextcloud 3D Viewer - Broken Access Control"
description: "Nextcloud 3D Viewer 1.7.9 through 3.3.1 contains an information disclosure vulnerability caused by missing share authorization in PublicFileController, letting attackers with share tokens access password-protected 3D model files without authentication, exploit requires knowledge of share token."
url: https://panop.io/threat-heartbeat/CVE-2026-104189/
---

# CVE-2026-104189 Nextcloud 3D Viewer - Broken Access Control

Nextcloud 3D Viewer 1.7.9 through 3.3.1 contains an information disclosure vulnerability caused by missing share authorization in PublicFileController, letting attackers with share tokens access password-protected 3D model files without authentication, exploit requires knowledge of share token.

CVSS base score 7.5 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.35% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-104189)

## Details

Type

Broken Access Control

Impact

Information Disclosure

CVSS vector

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

Published

27 October 2026

Updated

29 October 2026

Weakness

[CWE-306](https://cwe.mitre.org/data/definitions/306.html)

## Vendor fix

Upgrade to version 3.3.2 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-104189](https://nvd.nist.gov/vuln/detail/CVE-2026-104189)
- [https://github.com/maz1987in/3Dviewer-Nextcloud/commit/1b0ca86ff9a96b4e045cb379bc8b8c2fe05f2fae](https://github.com/maz1987in/3Dviewer-Nextcloud/commit/1b0ca86ff9a96b4e045cb379bc8b8c2fe05f2fae)
- [https://github.com/maz1987in/3Dviewer-Nextcloud/commit/2cfef0326afc56112b948b3fdf7e5c873fab4104](https://github.com/maz1987in/3Dviewer-Nextcloud/commit/2cfef0326afc56112b948b3fdf7e5c873fab4104)
- [https://github.com/maz1987in/3Dviewer-Nextcloud/releases/tag/v3.3.2](https://github.com/maz1987in/3Dviewer-Nextcloud/releases/tag/v3.3.2)
- [https://github.com/maz1987in/3Dviewer-Nextcloud/security/advisories/GHSA-gjh8-x4wm-3cfj](https://github.com/maz1987in/3Dviewer-Nextcloud/security/advisories/GHSA-gjh8-x4wm-3cfj)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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