2.6

CVE-2026-45155

Nextcloud: Private circle can be added to another circle via API

Private circle can be added to another circle via API

Nextcloud is an open source content collaboration platform. In Nextcloud Server from versions 32.0.0 to before 32.0.7 and 33.0.0 to before 33.0.1, a missing access check on API level allowed to add unknown circles by their ID directly to other circles. Since circle IDs have 62^15 complexity by default this is still unlikely to be executable at will, but if access to an ID was available via another source, memberships could be tracked like this. It is recommended that the Nextcloud Server is upgraded to 32.0.7 or 33.0.1. It is recommended that the Nextcloud Enterprise Server is upgraded to 29.0.16.14, 30.0.17.8, 31.0.14.3, 32.0.7 or 33.0.1
Mögliche Gegenmaßnahme
Server: * Disable app circles
Enterprise Server: * Disable app circles
Daten sind bereitgestellt durch das CVE Programm von einer CVE Numbering Authority (CNA) (Unstrukturiert).
Herstellernextcloud
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Produkt security-advisories
Version >= 32.0.0, < 32.0.7
Status affected
Version >= 33.0.0, < 33.0.1
Status affected
VulnDex Vulnerability Enrichment
Diese Information steht angemeldeten Benutzern zur Verfügung. Login Login
Weitere Schwachstelleninformationen
SystemNextcloud
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Produkt Server
Version >= 32.0.0, < 32.0.7
Version >= 33.0.0, < 33.0.1
SystemNextcloud
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Produkt Enterprise Server
Version >= 29.0.0, < 29.0.16.14
Version >= 30.0.0, < 30.0.17.8
Version >= 31.0.0, < 31.0.14.3
Version >= 32.0.0, < 32.0.7
Version >= 33.0.0, < 33.0.1
Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.2% 0.099
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
security-advisories@github.com 2.6 1.2 1.4
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:N
CWE-639 Authorization Bypass Through User-Controlled Key

The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-xpgv-grf9-gm7x
https://github.com/nextcloud/circles/pull/2401
https://hackerone.com/reports/3511998
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-xpgv-grf9-gm7x
Third Party Advisory