What is CVE-2023-28834?

CVE-2023-28834 is a low-severity vulnerability in Nextcloud Server, classified under Improper Removal of Sensitive Information Before Storage or Transfer. CVSS score: 3.5/10. Published 2023-04-03.

How severe is CVE-2023-28834?

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

Vulnerability in Nextcloud Server

CVE-2023-28834

Nextcloud Server is an open source personal cloud server. Nextcloud Server 24.0.0 until 24.0.6 and 25.0.0 until 25.0.4, as well as Nextcloud Enterprise Server 23.0.0 until 23.0.11, 24.0.0 until 24.0.6, and 25.0.0 until 25.0.4, have an information disclosure vulnerability. A user was able to get the full data directory path of the Nextcloud server from an API endpoint. By itself this information is not problematic as it can also be guessed for most common setups, but it could speed up other unknown attacks in the future if the information is known. Nextcloud Server 24.0.6 and 25.0.4 and Nextcloud Enterprise Server 23.0.11, 24.0.6, and 25.0.4 contain patches for this issue. There are no known workarounds.

Published 2023-04-03 · 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: 0.008 (55.3th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 55.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

Nextcloud Server
Nextcloud Security-Advisories — versions >= 23.0.0, < 23.0.14, >= 24.0.0, < 24.0.10, >= 25.0.0, < 25.0.4

Weakness classification (CWE)

CWE-212 — Improper Removal of Sensitive Information Before Storage or Transfer

References

github.com/nextcloud/security-advisories/security/advisories/GHSA-5w64-6c42-rgcv (Vendor Advisory)
github.com/nextcloud/server/issues/33883 (Exploit, Third Party Advisory, Issue Tracking)
github.com/nextcloud/server/pull/36094 (Patch)
hackerone.com/reports/1690510 (Exploit, Patch, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2023-28834?: CVE-2023-28834 is a low-severity vulnerability in Nextcloud Server, classified under Improper Removal of Sensitive Information Before Storage or Transfer. CVSS score: 3.5/10. Published 2023-04-03.
How severe is CVE-2023-28834?: Low severity. CVSS v3 base score is 3.5 out of 10.