What is CVE-2018-0528?

CVE-2018-0528 is a medium-severity vulnerability in Cybozu Office, classified under Information Disclosure. CVSS score: 4.3/10. Published 2018-06-26.

How severe is CVE-2018-0528?

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

Auth bypass in Cybozu Office

CVE-2018-0528

Cybozu Office 10.0.0 to 10.7.0 allows authenticated attackers to bypass authentication to view the schedules that are not permitted to access via unspecified vectors.

Vulnerability class: Information Disclosure

Published 2018-06-26 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.009 (57.2th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 57th percentile — 57.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

Cybozu Office
Cybozu, Inc. Cybozu Office — versions 10.0.0 to 10.7.0

Weakness classification (CWE)

References

support.cybozu.com/ja-jp/article/9812 (Third Party Advisory)
jvn.jp/en/jp/JVN51737843/index.html (Third Party Advisory, third-party-advisory)

Frequently asked questions

What is CVE-2018-0528?: CVE-2018-0528 is a medium-severity vulnerability in Cybozu Office, classified under Information Disclosure. CVSS score: 4.3/10. Published 2018-06-26.
How severe is CVE-2018-0528?: Medium severity. CVSS v3 base score is 4.3 out of 10.