CVE-2026-45155Nextcloud: Private circle can be added to another circle via API
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It affects nextcloud security-advisories. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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Free account, 1 product
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
- 2.6 LOW (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:N
- Weakness (CWE)
- CWE-639
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- GitHub_M
- NVD analysis
- Deferred
- Record last updated
- Jun 1, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
nextcloud security-advisories nextcloud:security_advisories (from the name) | from 32.0.0, < 32.0.7; from 33.0.0, < 33.0.1 | CNA record |
References
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-xpgv-grf9-gm7xx-refsource-confirm
- https://github.com/nextcloud/circles/pull/2401x-refsource-misc
- https://hackerone.com/reports/3511998x-refsource-misc
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.