CVE-2021-32653 json
Default settings leak federated cloud ID to lookup server of all users
published 2021-06-01 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-19473
- cvss
- 2.7
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.2%
- EPSS 1.2% chance of exploitation in 30 days, percentile 68%
- public exploits
- 0
- none known
Summary
Nextcloud Server is a Nextcloud package that handles data storage. Nextcloud Server versions prior to 19.0.11, 20.0.10, or 21.0.2 send user IDs to the lookup server even if the user has no fields set to published. The vulnerability is patched in versions 19.0.11, 20.0.10, and 21.0.2; no workarounds outside the updates are known to exist.
Patch / fix
- nextcloud nextcloud_server 19.0.11, 20.0.10, 21.0.2
- nextcloud Arch Linux 21.0.2-1
arch linux advisories AVG-2024
Exploit prediction
1.21% chance of exploitation in the next 30 days, higher than 68% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 2.7 | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N |
| NVD | 3.1 | 2.7 | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N |
| NVD | 2.0 | 4.0 | AV:N/AC:L/Au:S/C:P/I:N/A:N |
Affected products
- nextcloud security-advisories
Classification
- Weakness
-
- CWE-201 Insertion of Sensitive Information Into Sent Data
References
-
security.gentoo.org
/glsa/202208-17
vendor-advisory, third-party-advisory
-
github.com
/nextcloud/security-advisories/security/advisories/GHSA-396j-vqpr-qg45
third-party-advisory
-
hackerone.com
/reports/1173436
permissions-required, third-party-advisory
Sources
- CVE List CVE-2021-32653
- NVD CVE-2021-32653
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.