What is CVE-2017-8340?

CVE-2017-8340 is a high-severity vulnerability in Open-Xchange Appsuite, classified under Improper Access Control. CVSS score: 8.8/10. Published 2019-05-22.

How severe is CVE-2017-8340?

High severity. CVSS v3 base score is 8.8 out of 10.

Vulnerability in Open-Xchange Appsuite

CVE-2017-8340

Open-Xchange GmbH OX App Suite 7.8.3 and earlier is affected by: Incorrect Access Control.

Published 2019-05-22 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.010 (62.4th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 62nd percentile — 62.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.010 · change: -0.000

Affected products

Open-Xchange Appsuite

Weakness classification (CWE)

CWE-284 — Improper Access Control

References

ox.com (Not Applicable, Broken Link)
open-xchange.com (Vendor Advisory)
documentation.open-xchange.com/7.10.0/release-notes/release-notes.html (Vendor Advisory)

Frequently asked questions

What is CVE-2017-8340?: CVE-2017-8340 is a high-severity vulnerability in Open-Xchange Appsuite, classified under Improper Access Control. CVSS score: 8.8/10. Published 2019-05-22.
How severe is CVE-2017-8340?: High severity. CVSS v3 base score is 8.8 out of 10.