CVE-2023-23943

4.3 mediumEPSS 0.9%

Medium (4.3) in nextcloud mail. EPSS 0.9% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

4.3 medium

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

EPSS: 0.9% chance of exploitation in the next 30 days; higher than 60% of CVEs (scores of 2026-10-31)
CWE: CWE-918
Published: 2023-02-06
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

nextcloud:mail

References

https://github.com/nextcloud/mail/pull/7796
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-8gcx-r739-9pf6
https://hackerone.com/reports/1736390
https://hackerone.com/reports/1741525
https://hackerone.com/reports/1746582

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