What is CVE-2023-30539?

CVE-2023-30539 is a medium-severity vulnerability in Nextcloud Files Automated Tagging, classified under Improper Access Control. CVSS score: 6.5/10. Published 2023-04-17.

How severe is CVE-2023-30539?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Nextcloud Files Automated Tagging

CVE-2023-30539

Nextcloud is a personal home server system. Depending on the set up tags and other workflows this issue can be used to limit access of others or being able to grant them access when there are system tag based files access control or files retention rules. It is recommended that the Nextcloud Server is upgraded to 24.0.11 or 25.0.5, the Nextcloud Enterprise Server to 21.0.9.11, 22.2.10.11, 23.0.12.6, 24.0.11 or 25.0.5, and the Nextcloud Files automated tagging app to 1.11.1, 1.12.1, 1.13.1, 1.14.2, 1.15.3 or 1.16.1. Users unable to upgrade should disable all workflow related apps. Users are advised to upgrade.

Published 2023-04-17 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L.

EPSS exploit prediction

EPSS: 0.006 (48.0th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 48.0% 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 Files Automated Tagging — versions 1.11.0, 1.12.0, 1.13.0
Nextcloud Server
Nextcloud Security-Advisories — versions Nextcloud Server: < 24.0.11, Nextcloud Server: >= 25.0.0, < 25.0.5, Nextcloud Files automated tagging: >= 1.11.0, < 1.11.1

Weakness classification (CWE)

CWE-284 — Improper Access Control

References

github.com/nextcloud/security-advisories/security/advisories/GHSA-3m2f-v8x7-9w99 (Vendor Advisory)
github.com/nextcloud/files_automatedtagging/pull/705 (Patch, Issue Tracking)
github.com/nextcloud/server/pull/37252 (Patch)
hackerone.com/reports/1895976 (Permissions Required)

Frequently asked questions

What is CVE-2023-30539?: CVE-2023-30539 is a medium-severity vulnerability in Nextcloud Files Automated Tagging, classified under Improper Access Control. CVSS score: 6.5/10. Published 2023-04-17.
How severe is CVE-2023-30539?: Medium severity. CVSS v3 base score is 6.5 out of 10.