What is CVE-2023-49792?

CVE-2023-49792 is a medium-severity vulnerability in Nextcloud Server, classified under Improper Restriction of Excessive Authentication Attempts. CVSS score: 5.3/10. Published 2023-12-22.

How severe is CVE-2023-49792?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Is CVE-2023-49792 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Nextcloud Server

CVE-2023-49792

Nextcloud Server provides data storage for Nextcloud, an open source cloud platform. In Nextcloud Server prior to versions 26.0.9 and 27.1.4; as well as Nextcloud Enterprise Server prior to versions 23.0.12.13, 24.0.12.9, 25.0.13.4, 26.0.9, and 27.1.4; when a (reverse) proxy is configured as trusted proxy the server could be tricked into reading a wrong remote address for an attacker, allowing them executing authentication attempts than intended. Nextcloud Server versions 26.0.9 and 27.1.4 and Nextcloud Enterprise Server versions 23.0.12.13, 24.0.12.9, 25.0.13.4, 26.0.9, and 27.1.4 contain a patch for this issue. No known workarounds are available.

Published 2023-12-22 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

EPSS exploit prediction

EPSS: 0.010 (62.6th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 63rd percentile — 62.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000

Affected products

Nextcloud Server
Nextcloud Security-Advisories — versions >= 23.0.0, < 23.0.12.13, >= 24.0.0, < 24.0.12.9, >= 25.0.0, < 25.0.13.4

Weakness classification (CWE)

CWE-307 — Improper Restriction of Excessive Authentication Attempts

Public proof-of-concept exploits

CStockdale1/nextcloud-cve-2023-49792-research

References

github.com/nextcloud/security-advisories/security/advisories/GHSA-5j2p-q736-hw98 (Vendor Advisory)
github.com/nextcloud/server/pull/41526 (Patch)
hackerone.com/reports/2230915 (Permissions Required)

Frequently asked questions

What is CVE-2023-49792?: CVE-2023-49792 is a medium-severity vulnerability in Nextcloud Server, classified under Improper Restriction of Excessive Authentication Attempts. CVSS score: 5.3/10. Published 2023-12-22.
How severe is CVE-2023-49792?: Medium severity. CVSS v3 base score is 5.3 out of 10.
Is CVE-2023-49792 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.