CVE-2026-45155 Details
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
A vulnerability exists in the Nextcloud Server and Nextcloud Enterprise Server within specific version ranges, related to the Circles app. The issue arises from a missing access check at the API level, which allows the addition of unknown circles by their ID to other circles. Although the complexity of circle IDs makes this vulnerability difficult to exploit intentionally, there is a possibility of tracking memberships if an ID is obtained from another source. Users are advised to upgrade to the latest versions to address this vulnerability.
Users of Nextcloud Server should upgrade to version 32.0.7 or 33.0.1. Nextcloud Enterprise Server users should upgrade to version 29.0.16.14, 30.0.17.8, 31.0.14.3, 32.0.7 or 33.0.1.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Jun 1, 2026CISA-ADP
Assessed Jun 1, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/nextcloud/circles/pull/2401 | [email protected] | Issue TrackingVendor |
| https://github.com/nextcloud/security-advisories/security/advisories/GHSA-xpgv-grf9-gm7x | [email protected] | AdvisoryRemedyVendor |
| https://hackerone.com/reports/3511998 | [email protected] | Issue TrackingTechnical Description |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-639 | Authorization Bypass Through User-Controlled Key | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Nextcloud | >= 32.0.0, < 32.0.7 (semver) >= 33.0.0, < 33.0.1 (semver) |
CPE
Remediation
| |
| Nextcloud Enterprise | >= 29.0.0 (semver) >= 30.0.0 (semver) >= 31.0.0 (semver) >= 32.0.0 (semver) >= 33.0.0 (semver) |
CPE
Remediation
| |
Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 22, 2026 | CVE Translated | [email protected] |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Jun 1, 2026 | New CVE Received | [email protected] |