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CVE-2023-23943
Blind SSRF via server URL input in the Nextcloud Mail app
Medium5.0EPSS 0.92%
- Published
- Updated
- Reserved
- Assigned by
- GitHub_M
Description
Nextcloud mail is an email app for the nextcloud home server platform. In affected versions the SMTP, IMAP and Sieve host fields allowed to scan for internal services and servers reachable from within the local network of the Nextcloud Server. It is recommended that the Nextcloud Maill app is upgraded to 1.15.0 or 2.2.2. The only known workaround for this issue is to completely disable the nextcloud mail app.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_MCNA (assigner) | 3.1 | Medium5.0 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N |
| NVDNVD · Modified | 3.1 | Medium4.3 | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N |
- EPSS (exploitation in 30 days)
- 0.92% · top 40% of all CVEs (6 Nov 2026)
- CISA SSVC
- Exploitation: poc · Automatable: no · Technical impact: partial
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The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.0.
Weakness
Affected products
nextcloud · security-advisories
- affected >= 2.0.0, < 2.2.2
- affected < 1.15.0
References (5)
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-8gcx-r739-9pf6 (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://github.com/nextcloud/mail/pull/7796 (opens in a new tab)x_refsource_MISCx_transferred
- https://hackerone.com/reports/1736390 (opens in a new tab)x_refsource_MISCx_transferred
- https://hackerone.com/reports/1741525 (opens in a new tab)x_refsource_MISCx_transferred
- https://hackerone.com/reports/1746582 (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-2023-23943)Record last updated .