CVE-2026-45155
June 1, 2026, 6:14 p.m.
2.6
Low
Description
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
Product(s) Impacted
| Vendor | Product | Versions |
|---|---|---|
| Nextcloud |
|
|
Weaknesses
Common security weaknesses mapped to this vulnerability.
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.
*CPE(s)
Affected systems and software identified for this CVE.
| Type | Vendor | Product | Version | Update | Edition | Language | Software Edition | Target Software | Target Hardware | Other Information |
|---|---|---|---|---|---|---|---|---|---|---|
| a | nextcloud | nextcloud_server | <32.0.7 | / | / | / | / | / | / | / |
| a | nextcloud | nextcloud_server | <33.0.1 | / | / | / | / | / | / | / |
| a | nextcloud | nextcloud_enterprise_server | 29.0.16.14 | / | / | / | / | / | / | / |
| a | nextcloud | nextcloud_enterprise_server | 30.0.17.8 | / | / | / | / | / | / | / |
| a | nextcloud | nextcloud_enterprise_server | 31.0.14.3 | / | / | / | / | / | / | / |
| a | nextcloud | nextcloud_enterprise_server | 32.0.7 | / | / | / | / | / | / | / |
| a | nextcloud | nextcloud_enterprise_server | 33.0.1 | / | / | / | / | / | / | / |
Tags
CVSS Score
CVSS Data - 3.1
- Attack Vector: NETWORK
- Attack Complexity: HIGH
- Privileges Required: LOW
- Scope: UNCHANGED
- Confidentiality Impact: LOW
- Integrity Impact: NONE
- Availability Impact: NONE
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:N
Timeline
Published: June 1, 2026, 5:17 p.m.
Last Modified: June 1, 2026, 6:14 p.m.
Last Modified: June 1, 2026, 6:14 p.m.
Status : Deferred
CVE has been recently published to the CVE List and has been received by the NVD.
More infoSource
*Disclaimer: Some vulnerabilities do not have an associated CPE. To enhance the data, we use AI to infer CPEs based on CVE details. This is an automated process and might not always be accurate.