CVE-2021-32657

Malicious user could break user administration page

MEDIUM
4.3
CVSS Score
Published: June 1, 2021 at 10:10 PM UTC
Updated: June 17, 2026 at 03:53 AM UTC
1 product affected across 1 vendorNextcloud/server

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Severity
MEDIUM4.3
Exploit prediction
EPSS 2%

Description

Nextcloud Server is a Nextcloud package that handles data storage. In versions of Nextcloud Server prior to 10.0.11, 20.0.10, and 21.0.2, a malicious user may be able to break the user administration page. This would disallow administrators to administrate users on the Nextcloud instance. The vulnerability is fixed in versions 19.0.11, 20.0.10, and 21.0.2. As a workaround, administrators can use the OCC command line tool to administrate the Nextcloud users.

Affected

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

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_MISCThird Party Advisory
https://hackerone.com/reports/1147611
Vendor Advisoryx_refsource_GENTOOThird Party Advisory
https://security.gentoo.org/glsa/202208-17

CVSS

4.3MEDIUMGitHub_M
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
LOW
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-400

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