VulnerabilityPublished 27 Oct 2026

CVE-2026-104189: maz1987in 3Dviewer-Nextcloud · Missing Authentication

Affects maz1987in 3Dviewer-NextcloudSource CVE Database V5

Not known to be exploited · CVSS 7.5 High : upgrade to 3.3.2 soon.

Data as of 27 Oct 2026, 15:42 UTC

CVSS 3.1 base score

7.5High

How severe the flaw is on the 0–10 CVSS scale.

Patch: Available – fixed in 3.3.2

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

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: None
Availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: High: There is total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact.
Integrity: None: There is no loss of integrity within the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 27 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade 3Dviewer-Nextcloud and maz1987in/3Dviewer-Nextcloud to 3.3.2.

Affected software

Product	Affected	Fixed in
maz1987in3Dviewer-Nextcloud	Affected >=1.7.9 <3.3.2	Fixed in 3.3.2
GitHubmaz1987in/3Dviewer-Nextcloud`pkg:github/maz1987in/3Dviewer-Nextcloud`Other threats	Affected >=1.7.9 <3.3.2	Fixed in 3.3.2

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Upgrade the 3Dviewer-Nextcloud app to version 3.3.2 or later, where the vulnerability is fixed with proper password and token validation and brute-force throttling. As a temporary workaround before upgrading, disable the 3D Viewer app using 'occ app:disable threedviewer' or avoid relying on password protection for link shares containing 3D model files.

Description

CVE-2026-104189 is a vulnerability in the maz1987in 3Dviewer-Nextcloud app versions 1.7.9 through 3.3.1 where the public file endpoint did not enforce share authorization properly. This allowed anyone with a share token to access password-protected 3D model files without providing the password. The issue was fixed in version 3.3.2 by improving token and password validation and adding brute-force throttling.

Impact

An attacker who knows a share token could bypass password protection and access the contents of password-protected 3D model files shared via the vulnerable versions of the 3Dviewer-Nextcloud app. This results in unauthorized disclosure of sensitive 3D model data. The vulnerability does not affect non-3D files in the same share. There is no impact on integrity or availability reported. Expired shares do not leak data but return errors.

Summary

The 3D Viewer for Nextcloud app versions 1.7.9 through 3.3.1 had a missing authentication check on its public file endpoint. The PublicFileController marked routes as public pages but did not enforce password protection because it did not extend the PublicShareController, which handles password enforcement. Consequently, requests to the endpoint with a valid share token returned the full file contents even if the share was password-protected. This affected only 3D model files supported by the app (STL, GLB/glTF, OBJ, STEP, IFC, etc.) and not other file types. Expired shares returned errors instead of leaking data. The vulnerability was addressed in version 3.3.2 by having PublicFileController extend PublicShareController, implementing proper token and password validation, and rejecting invalid or expired shares. Workarounds include disabling the 3D Viewer app or avoiding password protection on link shares containing 3D files until patched.

CWE-306Missing Authentication for Critical Function (opens in a new tab)
Base weaknessLikelihood of exploit: HighCWE Top 25 (2025): #21OWASP Top 10 A07:2025: Authentication Failures (opens in a new tab)
The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.
Architecture and Design
Divide the software into anonymous, normal, privileged, and administrative areas. Identify which of these areas require a proven user identity, and use a centralized authentication capability.
Architecture and Design
For any security checks that are performed on the client side, ensure that these checks are duplicated on the server side, in order to avoid CWE-602. Attackers can bypass the client-side checks by modifying values after the checks have been performed, or by changing the client to remove the client-side checks…
Architecture and Design
Where possible, avoid implementing custom, "grow-your-own" authentication routines and consider using authentication capabilities as provided by the surrounding framework, operating system, or environment.
OWASP Cheat Sheets
OWASP Authentication (opens in a new tab)
OWASP ASVS 4.0.3
V1.2.3 (opens in a new tab)
V1.2.2 (opens in a new tab)
V1.2.4 (opens in a new tab)
Attack patterns
Choosing Message Identifier (opens in a new tab)
Force the System to Reset Values (opens in a new tab)
Using Unpublished Interfaces or Functionality (opens in a new tab)
Cross Site Request Forgery (opens in a new tab)
Communication Channel Manipulation (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).
CWE-863Incorrect Authorization (opens in a new tab)
Class weaknessLikelihood of exploit: HighCWE Top 25 (2025): #17OWASP Top 10 A01:2025: Broken Access Control (opens in a new tab)
The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.
Architecture and Design
Divide the product into anonymous, normal, privileged, and administrative areas. Reduce the attack surface by carefully mapping roles with data and functionality. Use role-based access control (RBAC) to enforce the roles at the appropriate boundaries.
Architecture and Design
Ensure that access control checks are performed related to the business logic. These checks may be different than the access control checks that are applied to more generic resources such as files, connections, processes, memory, and database records.
Architecture and Design · Libraries or Frameworks
Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
OWASP Cheat Sheets
Authorization (opens in a new tab)
OWASP ASVS 4.0.3
V8.3.8 (opens in a new tab)
V13.4.2 (opens in a new tab)
V7.2.2 (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

Community reviews

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 27 Oct 2026, 15:31 UTC

WeaknessesCWE-306, CWE-863

Technical details

References

Community reviews

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