CERT-FR Flags Multiple Nextcloud Vulnerabilities
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CERT-FR advisory details five CVEs in Nextcloud Server, Collectives, Team Folders and files_lock enabling privilege escalation, DoS and data exposure; patches available.
CERT-FR has published an advisory covering multiple vulnerabilities affecting the Nextcloud product suite, including Nextcloud Server (32.0.x, 33.0.x, 34.0.x), the Collectives app, the Team Folders app (multiple branches from 13.x through 22.x), and files_lock (33.0.x). The flaws, tracked under five CVEs (CVE-2026-68493, CVE-2026-77165, CVE-2026-77166, CVE-2026-77169, CVE-2026-82985) and corresponding GitHub security advisories, can allow an attacker to escalate privileges, cause a remote denial of service, bypass security policy, or access confidential data depending on the specific flaw and affected component.
No evidence of in-the-wild exploitation is mentioned in the advisory. CERT-FR directs administrators to the Nextcloud vendor bulletins for patch details and recommends upgrading to the fixed versions: Collectives 4.4.1+, files_lock 33.0.6+, Server 32.0.12+/33.0.6+/34.0.1+, and the various Team Folders branch fixes (ranging from 13.1.8 to 22.0.1 depending on branch).
Defenders running self-hosted Nextcloud instances, particularly those exposing collaborative file-sharing and team folder features, should prioritize patching to the versions specified, as the vulnerabilities span confidentiality, integrity (policy bypass), and availability impacts across core and plugin components.
Mentioned in this report
Source reporting: https://www.cert.ssi.gouv.fr/avis/CERTFR-2026-AVI-1283
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