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CVE-2021-32653

Default settings leak federated cloud ID to lookup server of all users

LOW
2.7
CVSS Score
Published: June 1, 2021 at 07:50 PM UTC
Updated: June 17, 2026 at 03:53 AM UTC
1 product affected across 1 vendorNextcloud/server

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Severity
LOW2.7
Exploit prediction
EPSS 1%

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Nextcloud/server· Nextcloudnextcloud-app
95%
v < 19.0.1120.0.0 ≤ v < 20.0.1021.0.0 ≤ v < 21.0.2
Affected range stops below 19.0.11, so it looks safe — our inference, not a vendor statement
Affected range stops below 20.0.10, so it looks safe — our inference, not a vendor statement
Affected range stops below 21.0.2, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

x_refsource_CONFIRMThird Party Advisory
Source: [email protected]
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-396j-vqpr-qg45
x_refsource_MISCPermissions RequiredThird Party Advisory
Source: [email protected]
https://hackerone.com/reports/1173436
Vendor Advisoryx_refsource_GENTOOThird Party Advisory
Source: [email protected]
https://security.gentoo.org/glsa/202208-17

CVSS

2.7LOWGitHub_M
Attack Vector
NETWORK
Complexity
LOW
Privileges
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-201

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