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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…
Medium4.3EPSS 0.99%
- Published
- Updated
- Reserved
- Assigned by
- hackerone
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.
Timeline
ID reserved
By hackerone
- 5 months later
· 5 months later
Published
- 3 years later
· 3 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | Medium4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N |
- EPSS (exploitation in 30 days)
- 0.99% · top 37% of all CVEs (7 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 4.3.
Weakness
Affected products
Nextcloud Mail
- affected Fixed in 1.9.5
References (4)
- https://hackerone.com/reports/1129996 (opens in a new tab)x_refsource_MISCx_transferred
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-jmgp-77jq-fjp3 (opens in a new tab)x_refsource_MISCx_transferred
- https://github.com/nextcloud/mail/pull/4864 (opens in a new tab)x_refsource_MISCx_transferred
- https://github.com/nextcloud/mail/releases/tag/v1.9.5 (opens in a new tab)x_refsource_MISCx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2021-22896)Record last updated .