Medium severity · published Jun 11, 2021
CVE-2021-22896
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
4.3
CVSS
1%
EPSS
No
On KEV
Description
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 vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.0% · higher than 62% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
NE
Nextcloud · Nextcloud
before 1.9.5 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-22896
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-22896
Patch
https://github.com/nextcloud/mail/pull/4864
Release Notes
https://github.com/nextcloud/mail/releases/tag/v1.9.5
Third Party Advisory
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-jmgp-77jq-fjp3
Third Party Advisory
https://hackerone.com/reports/1129996
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