What is CVE-2023-48307?

CVE-2023-48307 is a low-severity vulnerability in Nextcloud Mail, classified under Server-Side Request Forgery (SSRF). CVSS score: 3.5/10. Published 2023-11-21.

How severe is CVE-2023-48307?

Low severity. CVSS v3 base score is 3.5 out of 10.

SSRF in Nextcloud Mail

CVE-2023-48307

Nextcloud Mail is the mail app for Nextcloud, a self-hosted productivity platform. Starting in version 1.13.0 and prior to version 2.2.8 and 3.3.0, an attacker can use an unprotected endpoint in the Mail app to perform a SSRF attack. Nextcloud Mail app versions 2.2.8 and 3.3.0 contain a patch for this issue. As a workaround, disable the mail app.

Vulnerability class: SSRF (Server-Side Request Forgery)

Published 2023-11-21 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 3.5 (Low). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:L.

EPSS exploit prediction

EPSS: 0.009 (57.1th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 57th percentile — 57.1% 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 >= 1.13.0, < 2.2.8, >= 3.1.0, < 3.3.0

Weakness classification (CWE)

CWE-918 — Server-Side Request Forgery (SSRF)

References

github.com/nextcloud/security-advisories/security/advisories/GHSA-4pp4-m8ph-2999 (Vendor Advisory)
github.com/nextcloud/mail/pull/8709 (Patch, Issue Tracking)
hackerone.com/reports/1869714 (Permissions Required)

Frequently asked questions

What is CVE-2023-48307?: CVE-2023-48307 is a low-severity vulnerability in Nextcloud Mail, classified under Server-Side Request Forgery (SSRF). CVSS score: 3.5/10. Published 2023-11-21.
How severe is CVE-2023-48307?: Low severity. CVSS v3 base score is 3.5 out of 10.