Nextcloud is an open-source, self-hosted file sync and sharing platform used by organizations to run private cloud storage and collaboration services.
Overview
Nextcloud is an open-source, self-hosted file sync and sharing platform used by organizations to run private cloud storage and collaboration services. Its cybersecurity relevance is underscored by active vulnerability management (e.g., XSS fixes) and strong guidance on enabling multi-factor authentication to mitigate credential theft, making it a significant enterprise cloud_service security concern.
Related Threat Clusters
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Critical FFmpeg Vulnerability Enables Remote Code Execution via Malicious Media Files
A critical vulnerability in FFmpeg's MagicYUV decoder, tracked as CVE-2026-8461, allows attackers to exploit heap out-of-bounds writes to crash systems or execute remote code. Discovered by JFrog, the flaw affects a…
9 articles · Updated June 23, 2026 -
Fedora NextCloud Update Addresses JSON Tampering and DoS Vulnerabilities
On June 5, 2026, Fedora released updates for NextCloud addressing two critical vulnerabilities: CVE-2026-42044 and CVE-2026-44167. CVE-2026-42044 involves JSON response tampering via prototype pollution in Axios, while…
2 articles · Updated June 5, 2026 -
Critical RCE and DoS Vulnerabilities in Nextcloud Affect Fedora Users
On May 2, 2026, Fedora released an advisory for Nextcloud version 33.0.3, addressing multiple critical vulnerabilities, including remote code execution (RCE) and denial of service (DoS) issues. The vulnerabilities are…
3 articles · Updated May 10, 2026 -
Critical Authentication Bypass Vulnerabilities in Nextcloud for Fedora 44
On June 17, 2026, Fedora released a security advisory for Nextcloud version 33.0.5, addressing multiple vulnerabilities. Key issues include CVE-2026-45690, an authentication bypass that allows unauthorized access by…
2 articles · Updated June 17, 2026 -
FortiBleed Campaign Links Credential Theft to Ransomware Operations
The FortiBleed campaign has been linked to two ransomware groups, INC Ransom and Lynx, through an operational security lapse that revealed one actor's simultaneous access to both groups' negotiation panels. This…
4 articles · Updated July 2, 2026 -
AI-Generated Bug Reports Overwhelm Bug Bounty Programs
Bug bounty programs are facing a significant surge in low-quality AI-generated vulnerability reports, leading some companies to suspend their initiatives. Reports submitted through platforms like Bugcrowd have…
16 articles · Updated May 18, 2026 -
Nextcloud ACL Rename Permission Bypass Vulnerability Disclosed
A new vulnerability, CVE-2026-45264, has been identified in Nextcloud, an open-source content collaboration platform. This flaw affects versions 17.0.0 to before 17.0.15, 18.0.0 to before 18.1.12, 19.0.0 to before…
4 articles · Updated June 1, 2026 -
Nextcloud CVE-2026-45277: Low-Severity Information Disclosure Vulnerability
CVE-2026-45277 is a low-severity vulnerability affecting Nextcloud versions prior to 2.7.2. Authenticated users could exploit this flaw to determine if arbitrary files are linked to specific approval workflows,…
3 articles · Updated June 1, 2026 -
MFA Lapses Lead to Data Theft of 50 Organizations
A major infostealer campaign has compromised sensitive data from 50 global enterprises, with the data available for sale on the dark web. Victims include firms such as Pickett and Associates, Sekisui House, and Iberia.…
4 articles · Updated January 6, 2026 -
ownCloud Users Urged to Enable MFA Amid Credential Theft Reports
ownCloud has advised its users to activate multi-factor authentication (MFA) following reports of credential theft that could allow attackers to access sensitive data. The warning comes as a threat actor, Zestix, is…
2 articles · Updated January 7, 2026
Recent Intelligence Reports
- FortiBleed Actors Collaborating With Inc, Lynx Ransomware Gangs — Darkreading · July 2, 2026
- Hole in widely — Csoonline · June 24, 2026
- Critical FFmpeg flaw discovered: just watching a video can fully compromise your system — Cybernews · June 23, 2026
- FFmpeg fixes PixelSmash flaw in widely used video decoder — Bleepingcomputer · June 22, 2026
- Fedora 44 Nextcloud 33.0.5 Security Advisory FEDORA-2026 — Linuxsecurity · June 17, 2026
- Fedora 43 Nextcloud 33.0.5 Major Security Advisory on Authentication Bypass — Linuxsecurity · June 17, 2026
- Fedora 44 NextCloud Update Denial of Service JSON Tampering 2026 — Linuxsecurity · June 5, 2026
- Fedora 43 nextcloud 33.0.4 Critical JSON Tampering DoS CVE-2026 — Linuxsecurity · June 5, 2026