What is CVE-2023-33184?

CVE-2023-33184 is a low-severity vulnerability in Nextcloud Mail, classified under Server-Side Request Forgery (SSRF). CVSS score: 3.5/10. Published 2023-05-27.

How severe is CVE-2023-33184?

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

SSRF in Nextcloud Mail

CVE-2023-33184

Nextcloud Mail is a mail app in Nextcloud. A blind SSRF attack allowed to send GET requests to services running in the same web server. It is recommended that the Mail app is update to version 3.02, 2.2.5 or 1.15.3.

Vulnerability class: SSRF (Server-Side Request Forgery)

Published 2023-05-27 · 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:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.005 (42.5th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 42nd percentile — 42.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

Nextcloud Mail
Nextcloud Security-Advisories — versions < 1.15.3, < 2.2.5, < 3.02

Weakness classification (CWE)

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

References

github.com/nextcloud/security-advisories/security/advisories/GHSA-8gph-9895-w564 (Vendor Advisory)
github.com/nextcloud/mail/pull/8275 (Patch)
hackerone.com/reports/1913095 (Issue Tracking)

Frequently asked questions

What is CVE-2023-33184?: CVE-2023-33184 is a low-severity vulnerability in Nextcloud Mail, classified under Server-Side Request Forgery (SSRF). CVSS score: 3.5/10. Published 2023-05-27.
How severe is CVE-2023-33184?: Low severity. CVSS v3 base score is 3.5 out of 10.