CVE-2021-41239

mediumpriority · track · 21OT risk · elevatedEPSS 0.012 · 69 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

1.25% (69th) EPSS

CVSS 5 · medium

Is it mine?

6 products

Check your exposure

Who says so?

3 sources

cnnvd · enisa_euvd · nvd

EPSS · scored 2026-10-27

Nextcloud server is a self hosted system designed to provide cloud style services. In affected versions the User Status API did not consider the user enumeration settings by the administrator. This allowed a user to enumerate other users on the instance, even when user listings where disabled. It is recommended that the Nextcloud Server is upgraded to 20.0.14, 21.0.6 or 22.2.1. There are no known workarounds.

cvss

Technical severity, 0–10. One row per scoring source.

5.3

010

base score 0–10 · higher = more severe · hover a vector to decode

v2.05mediumAV:N/AC:L/Au:N/C:P/I:N/A:Nprimary · NVD / NIST USexploitability 10 · impact 2.9

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:Nprimary · NVD / NIST USexploitability 3.9 · impact 1.4

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:Nsecondary · ENISA EU

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:Nsecondary · security-advisories@github.comexploitability 3.9 · impact 1.4

v3.14.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:Usecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: yes · Technical Impact: partialcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-862USprimaryCWE-200US

affected products (6)

Products and version ranges known to be affected.

nextcloud security-advisories≤ < 20.0.14enisa_euvdEU
nextcloud security-advisories21.0.0, → 21.0.6enisa_euvdEU
nextcloud security-advisories22.2.0, → 22.2.1enisa_euvdEU
nextcloud nextcloud server< 20.0.14nvdUScpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:*
nextcloud nextcloud server21.0.0 → 21.0.6nvdUScpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:*
nextcloud nextcloud server= 22.2.0nvdUScpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:*

also known as (2)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd NVD CVE.org MITRE

published 2022-03-08modified 2026-06-17

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+11474 more

references (15)

External citations — patches, advisories, analysis.

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