CVE-2021-22896

low-risk
Published 2021-06-11

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.

Do I need to act?

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0.41% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
4
CVSS 4.3/10 Medium
NETWORK / LOW complexity

Affected Products (1)

Affected Vendors

Nextcloud

References (8)

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-7...
Third Party Advisory https://hackerone.com/reports/1129996
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-7...
Third Party Advisory https://hackerone.com/reports/1129996
25
/ 100
low-risk
Severity 18/34 · Moderate
Exploitability 2/34 · Minimal
Exposure 5/34 · Minimal