The vulnerability of the synchronization tool for NextCloud’s desktop, related to the lack of security measures for the website structure, allows attackers to execute arbitrary code.

The vulnerability of the synchronization tool for NextCloud’s desktop interface is related to the lack of measures taken to protect the structure of the web page. Exploiting this vulnerability allows a remote attacker to execute arbitrary code...

CVE-2026-45156

Nextcloud is an open source content collaboration platform. From versions 0.3.0 to before 3.1.0, 5.0.0 to before 5.1.0, and 6.0.0 to before 6.4.0, a missing signature verification in User OIDC allowed a malicious ID4me authority to identify as any user. This issue has been patched in versions...

SUSE CVE-2026-45157

Nextcloud is an open source content collaboration platform. In Nextcloud Server from versions 32.0.0 to before 32.0.9, and 33.0.0 to before 33.0.3, when a malicious user has access to a file share of a user, they could use this share token to also access the chunking upload directly and see...

CVE-2026-45155

A flaw was found in Nextcloud Server. A missing access check at the API Application Programming Interface level could allow an authenticated attacker, who has access to a circle ID from another source, to add unknown circles to other circles. This could lead to the disclosure of circle membership...

CVE-2026-45283

A flaw was found in Nextcloud Server. An authenticated user could exploit this vulnerability to lock or unlock files belonging to other users by manipulating WebDAV Web Distributed Authoring and Versioning paths. This issue also led to the disclosure of lock tokens in error responses, potentially...

CVE-2026-45157

A flaw was found in Nextcloud Server. A malicious user with access to a file share could exploit this vulnerability by using the share token to directly access the chunking upload process. This allows the attacker to view temporary part files during ongoing uploads, leading to information...

CVE-2026-45810

A flaw was found in Nextcloud Server. An authenticated user with access to any file comment could exploit a missing relation check. This vulnerability allows the user to read the content of all comments within the system, leading to information disclosure. Mitigation Mitigation for this issue is...

CVE-2026-45691

A flaw was found in Nextcloud Server. An attacker could reuse a pre-two-factor authentication 2FA session cookie as a Bearer token. This allows them to authenticate against DAV endpoints, granting unauthorized read and write access and bypassing the mandatory two-factor authentication. Mitigation...

CVE-2026-45279

A flaw was found in Nextcloud Server. This vulnerability allows non-admin users to perform a path traversal when the lang variable is used in the template directory configuration. An attacker can exploit this to copy arbitrary files, subject to existing Unix permissions, into their own Nextcloud...

CVE-2026-45285

A flaw was found in Nextcloud. When a user shares a folder or file with a Nextcloud Team that includes an external member, the system automatically generates a public link for that external member. This link, which is not visible to the folder owner, grants the same permissions as the Team's...

CVE-2026-45281

A flaw was found in Nextcloud Server. An authenticated user, with knowledge of another user's principal URL, could exploit improper authorization controls to gain full access to that user's calendar. This allows the attacker to view and modify the victim's calendar, leading to unauthorized...

CVE-2026-45690

A flaw was found in Nextcloud Server. This vulnerability allows a remote attacker, with knowledge of a user's password, to bypass two-factor authentication 2FA protections. When a user attempts to log in with valid credentials on a 2FA-enabled account, a temporary session token is generated befor...

CVE-2026-45810

Nextcloud is an open source content collaboration platform. In Nextcloud Server from versions 31.0.0 to before 31.0.12, and 32.0.0 to before 32.0.3, a missing check of a relation allowed authenticated users with access to any file comment, to read the content of all comments. It is recommended th...

CVE-2026-45722

Nextcloud is an open source content collaboration platform. From versions 0.9.0 to before 0.9.7, and 1.0.0 to before 1.0.2, a missing sanitization in the Tables app allowed a user with access to the tables app to perform a limited SQL injection in the ORDER BY statement of a query. Compared to...

CVE-2026-45691

Nextcloud is an open source content collaboration platform. In Nextcloud Server from versions 32.0.0 to before 32.0.9, and 33.0.0 to before 33.0.3, a pre-2FA session cookie created after successful password authentication but before TOTP completion could be reused as a Bearer token to authenticat...

CVE-2026-45545

Nextcloud is an open source content collaboration platform. From versions 0.7.0 to before 0.7.7, 0.8.0 to before 0.8.10, 0.9.0 to before 0.9.8, and 1.0.0 to before 1.0.4, an authenticated attacker with access to the Tables app may be able to execute arbitrary up to 20 bytes long SQL queries,...

CVE-2026-45543

Nextcloud is an open source content collaboration platform. From version 4.3.0 to before version 5.2.7, a removed collaborator retains unauthorized read access to uploaded respondent files for the affected form. The scope is limited to uploaded files for forms where that user previously had resul...

CVE-2026-45544

Nextcloud is an open source content collaboration platform. From version 0.8.0 to before version 1.0.4, the view filter criteria is exposed to users with read-only permissions in Nextcloud Tables. This issue has been patched in versions 1.0.4 and 2.0.0...

CVE-2026-45282

Nextcloud is an open source content collaboration platform. In Nextcloud Server from versions 32.0.0 to before 32.0.9, and 33.0.0 to before 33.0.3, an authenticated attacker can access attachments of link shares when knowing the share token, circumventing password protection or download...

CVE-2026-45283

Nextcloud is an open source content collaboration platform. In Nextcloud Server from versions 32.0.0 to before 32.0.2, and 33.0.0 to before 33.0.1, the fileslock app did not properly validate the ownership of files when processing DAV lock and unlock requests. An authenticated user could lock or...