CVE-2021-22896

mediumpriority · track · 17OT risk · elevatedEPSS 0.010 · 62 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.99% (62nd) EPSS

CVSS 4 · medium

Is it mine?

3 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · osv · nvd

EPSS · scored 2026-10-27

Nextcloud Mail before 1.9.5 suffers from improper access control due to a missing permission check allowing other authenticated users to create mail aliases for other users.

cvss

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

4.3

010

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

v2.04mediumAV:N/AC:L/Au:S/C:N/I:P/A:Nprimary · NVD / NIST USexploitability 8 · impact 2.9

v3.14.3mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:Nprimary · NVD / NIST USexploitability 2.8 · impact 1.4

v3.14mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-862USprimary

affected products (3)

Products and version ranges known to be affected.

n/a Nextcloud Mail≤ Fixed in 1.9.5enisa_euvdEU
nextcloud nextcloud< 1.9.5nvdUScpe:2.3:a:nextcloud:nextcloud:*:*:*:*:*:*:*:*
Bitnami nextcloud< 1.9.5osvUSpkg:bitnami/nextcloud

advisories (1)

Vendor and ecosystem advisories describing this.

BIT-nextcloud-2021-228962026-07-12vendor · osvUS
Nextcloud Mail before 1.9.5 suffers from improper access control due to a missing permission check allowing other authenticated users to create mail aliases for other users.

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd osv nvd NVD CVE.org MITRE

published 2021-06-11modified 2026-06-17

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+11496 more

references (13)

External citations — patches, advisories, analysis.

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