What is CVE-2023-28844?

CVE-2023-28844 is a medium-severity vulnerability in Nextcloud Server, classified under Improper Access Control. CVSS score: 5.7/10. Published 2023-03-31.

How severe is CVE-2023-28844?

Medium severity. CVSS v3 base score is 5.7 out of 10.

Vulnerability in Nextcloud Server

CVE-2023-28844

Nextcloud server is an open source home cloud implementation. In affected versions users that should not be able to download a file can still download an older version and use that for uncontrolled distribution. This issue has been addressed in versions 24.0.10 and 25.0.4. Users are advised to upgrade. There are no known workarounds for this vulnerability.

Published 2023-03-31 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.7 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.006 (47.6th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 47.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Nextcloud Server
Nextcloud Security-Advisories — versions >= 25.0.0, < 25.0.4, < 24.0.10

Weakness classification (CWE)

CWE-284 — Improper Access Control

References

github.com/nextcloud/security-advisories/security/advisories/GHSA-w47p-f66h-h2vj (Vendor Advisory)
github.com/nextcloud/server/pull/36113 (Patch)

Frequently asked questions

What is CVE-2023-28844?: CVE-2023-28844 is a medium-severity vulnerability in Nextcloud Server, classified under Improper Access Control. CVSS score: 5.7/10. Published 2023-03-31.
How severe is CVE-2023-28844?: Medium severity. CVSS v3 base score is 5.7 out of 10.