CVE-2021-22896 json
Nextcloud Mail before 1.9.5 suffers from improper access control due to a missing permission check allowing other authenticated users to cr…
published 2021-06-11 5 y ago modified 2026-09-08 2 mo ago also BIT-nextcloud-2021-22896 , EUVD-2021-10028 , GHSA-jmgp-77jq-fjp3
- cvss
- 4.3
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.0%
- EPSS 1.0% chance of exploitation in 30 days, percentile 62%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- bitnami nextcloud 1.9.5
- nextcloud nextcloud 1.9.5
- github.com/nextcloud/mail#4864 pull request
- github.com/nextcloud/mail/releases/tag/v1.9.5 release
Exploit prediction
0.99% chance of exploitation in the next 30 days, higher than 62% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N |
| NVD | 2.0 | 4.0 | AV:N/AC:L/Au:S/C:N/I:P/A:N |
| OSV | 3.1 | 4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| bitnami | nextcloud | <1.9.5 |
1.9.5 |
Affected products
- n/a Nextcloud Mail
Classification
- Weakness
-
- CWE-862 Missing Authorization
References
-
github.com
/nextcloud/mail/pull/4864
patch, third-party-advisory, advisory
-
hackerone.com
/reports/1129996
third-party-advisory, advisory
-
github.com
/nextcloud/security-advisories/security/advisories/GHSA-jmgp-77jq-fjp3
third-party-advisory, advisory
-
github.com
/nextcloud/mail/releases/tag/v1.9.5
release-notes, third-party-advisory, advisory
-
nvd.nist.gov
/vuln/detail/CVE-2021-22896
web
Sources
- CVE List CVE-2021-22896
- NVD CVE-2021-22896
- OSV BIT-nextcloud-2021-22896
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