What is CVE-2023-49790?

CVE-2023-49790 is a medium-severity vulnerability in Nextcloud, classified under Improper Authentication. CVSS score: 4.3/10. Published 2023-12-22.

How severe is CVE-2023-49790?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Auth bypass in Nextcloud

CVE-2023-49790

The Nextcloud iOS Files app allows users of iOS to interact with Nextcloud, a self-hosted productivity platform. Prior to version 4.9.2, the application can be used without providing the 4 digit PIN code. Nextcloud iOS Files app should be upgraded to 4.9.2 to receive the patch. No known workarounds are available.

Vulnerability class: Broken Authentication

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

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.

EPSS exploit prediction

EPSS: 0.003 (19.1th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 19th percentile — 19.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

Nextcloud
Nextcloud Security-Advisories — versions < 4.9.2

Weakness classification (CWE)

CWE-287 — Improper Authentication

References

github.com/nextcloud/security-advisories/security/advisories/GHSA-j8g7-88vv-rggv (Vendor Advisory)
github.com/nextcloud/ios/pull/2665 (Patch)
hackerone.com/reports/2245437 (Third Party Advisory)

Frequently asked questions

What is CVE-2023-49790?: CVE-2023-49790 is a medium-severity vulnerability in Nextcloud, classified under Improper Authentication. CVSS score: 4.3/10. Published 2023-12-22.
How severe is CVE-2023-49790?: Medium severity. CVSS v3 base score is 4.3 out of 10.