What is CVE-2020-12643?

CVE-2020-12643 is a medium-severity vulnerability in Open-Xchange Appsuite, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 4.3/10. Published 2020-08-31.

How severe is CVE-2020-12643?

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

Auth bypass in Open-Xchange Appsuite

CVE-2020-12643

OX App Suite 7.10.3 and earlier has Incorrect Access Control via an /api/subscriptions request for a snippet containing an email address.

Vulnerability class: IDOR (Insecure Direct Object Reference)

Published 2020-08-31 · last modified 2026-06-17.

CVSS v3 metric

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

EPSS exploit prediction

EPSS: 0.006 (48.1th percentile), scored 2026-10-04.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 48.1% 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

Open-Xchange Appsuite

Weakness classification (CWE)

CWE-639 — Authorization Bypass Through User-Controlled Key

References

www.open-xchange.com/ (Vendor Advisory)
seclists.org/fulldisclosure/2020/Aug/14 (mailing-list, Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2020-12643?: CVE-2020-12643 is a medium-severity vulnerability in Open-Xchange Appsuite, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 4.3/10. Published 2020-08-31.
How severe is CVE-2020-12643?: Medium severity. CVSS v3 base score is 4.3 out of 10.