SSRF in Nextcloud Mail
CVE-2023-23943
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.
Vulnerability class: SSRF (Server-Side Request Forgery)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.0 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.009 (58.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 59th percentile — 58.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000
Affected products
- Nextcloud Mail
- Nextcloud Security-Advisories — versions >= 2.0.0, < 2.2.2, < 1.15.0
Weakness classification (CWE)
References
- github.com/nextcloud/security-advisories/security/advisories/GHSA-8gcx-r739-9pf6 (Vendor Advisory)
- github.com/nextcloud/mail/pull/7796 (Patch)
- hackerone.com/reports/1736390 (Exploit, Third Party Advisory)
- hackerone.com/reports/1741525 (Exploit, Third Party Advisory)
- hackerone.com/reports/1746582 (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2023-23943?
- CVE-2023-23943 is a medium-severity vulnerability in Nextcloud Mail, classified under Server-Side Request Forgery (SSRF). CVSS score: 5.0/10. Published 2023-02-06.
- How severe is CVE-2023-23943?
- Medium severity. CVSS v3 base score is 5.0 out of 10.