Vulnerability 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
CVSS Score
LOW
Related Weaknesses (CWE)
References
- https://github.com/nextcloud/circles/pull/2401
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-xpgv-g
- https://hackerone.com/reports/3511998
FAQ
What is CVE-2026-45155?
CVE-2026-45155 is a vulnerability with a CVSS score of 2.6 (LOW). 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 un...
How severe is CVE-2026-45155?
CVE-2026-45155 has been rated LOW with a CVSS base score of 2.6/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-45155?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.