CVE-2026-45286 Nextcloud: Calendar app leaked user identifiers via attendee suggestion endpoint

Nextcloud is an open source content collaboration platform. From versions 5.5.13 to before 5.5.17, and 6.2.0 to before 6.2.3, an authenticated user can enumerate users on the same Nextcloud instance by using the Calendar app's endpoint for suggesting attendees. The sharing restrictions, applied t...

CVE-2026-45286

CVE-2026-45286 affects Nextcloud Open Source Content Collaboration Platform. An authenticated user could enumerate other users on the same instance by abusing the Calendar app’s endpoint for suggesting attendees; standard sharing restrictions did not apply to that endpoint. Impacted versions are ...

Calendar app leaked user identifiers via attendee suggestion endpoint

None...

ROS-20260129-73-0048

Vulnerability in nextcloud-app-calendar related to improper handling of an unexpected data type. Exploitation of the vulnerability could allow an attacker to cause a denial of service...

CVE-2025-66511 Nextcloud Calendar app used predictable proposal participant tokens

Nextcloud Calendar is a calendar app for Nextcloud. Prior to 6.0.3, the Calendar app generates participant tokens for meeting proposals using a hash function, allowing an attacker to compute valid participant tokens, which allowed them to request details and submit dates in meeting proposals. The...

Calendar app allowed booking appointments without the generated token

None...

Calendar attachments of local files are offered to downloaded

None...

EUVD-2023-52368

Malicious code in bioql PyPI...

EUVD-2023-57171

Malicious code in bioql PyPI...

MAL-2025-13993 Malicious code in acerta-calendar-gui (npm)

The package acerta-calendar-gui was found to contain malicious code...

CVE-2023-33183

Calendar app for Nextcloud easily sync events from various devices with your Nextcloud. Some internal paths of the website are disclosed when the SMTP server is unavailable. It is recommended that the Calendar app is updated to 3.5.5 or 4.2.3...

CVE-2023-48308

Nextcloud/Cloud is a calendar app for Nextcloud. An attacker can gain access to stacktrace and internal paths of the server when generating an exception while editing a calendar appointment. It is recommended that the Nextcloud Calendar app is upgraded to 4.5.3...

CVE-2024-37316

Nextcloud Calendar is a calendar app for Nextcloud. Authenticated users could create an event with manipulated attachment data leading to a bad redirect for participants when clicked. It is recommended that the Nextcloud Calendar App is upgraded to 4.6.8 or 4.7.2...

CVE-2024-37316 Nextcloud Calendar's event create can create attachments that link to other websites

Nextcloud Calendar is a calendar app for Nextcloud. Authenticated users could create an event with manipulated attachment data leading to a bad redirect for participants when clicked. It is recommended that the Nextcloud Calendar App is upgraded to 4.6.8 or 4.7.2...

Event create can create attachments that link to other websites

None...

Huawei HarmonyOS and EMUI Stray Permissions Vulnerability

Huawei HarmonyOS is an operating system from Huawei, a Chinese company. It provides a full-scene distributed operating system based on a microkernel.Huawei EMUI is an emotional operating system developed by Huawei based on Android Android. Huawei HarmonyOS and EMUI are vulnerable to a stray...

Huawei HarmonyOS and EMUI Authentication Bypass Vulnerability

Huawei HarmonyOS is an operating system from Huawei, a Chinese company. It provides a full-scene distributed operating system based on a microkernel.Huawei EMUI is an emotional operating system developed by Huawei based on Android Android. An authentication bypass vulnerability exists in Huawei...

CVE-2023-52545

Vulnerability of undefined permissions in the Calendar app. Impact: Successful exploitation of this vulnerability will affect availability...

CVE-2023-52546

Vulnerability of package name verification being bypassed in the Calendar app. Impact: Successful exploitation of this vulnerability may affect service confidentiality...

CVE-2023-52545

Vulnerability of undefined permissions in the Calendar app. Impact: Successful exploitation of this vulnerability will affect availability...