Is there a public exploit for CVE-2026-104189?

No public exploit for CVE-2026-104189 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

How severe is CVE-2026-104189?

CVE-2026-104189 scores CVSS 7.5 (v3.1), rated high.

7.5 High

The 3D Viewer for Nextcloud is a comprehensive 3D model viewer application for Nextcloud that supports multiple 3D file formats.

CVE-2026-104189

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…

Assessment

CVSS: 7.5 (v3.1)
Severity: High
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 27 October 2026
Last updated: 28 October 2026
Weakness: CWE-306, CWE-863
Assigner: security-advisories@github.com

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

At the source

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