Description
After guessing a 62^15 complex unique identifier, a malicious logged in user was able to retrieve a list of memberships for a circle they are not a member of.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Nextcloud | Server | 32.0.0 – ≤ 34.0.0 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | nextcloud-server-33 | No fix yet | — |
Advisories 1
- WID-SEC-2026-3840 Nextcloud: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 8, 2026