What is CVE-2023-26595?

CVE-2023-26595 is a medium-severity vulnerability in Cybozu Garoon, classified under Uncontrolled Resource Consumption. CVSS score: 6.5/10. Published 2023-05-23.

How severe is CVE-2023-26595?

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

Resource exhaustion in Cybozu Garoon

CVE-2023-26595

Denial-of-service (DoS) vulnerability in Message of Cybozu Garoon 4.10.0 to 5.9.2 allows a remote authenticated attacker to cause a denial of service condition.

Vulnerability class: DoS (Denial of Service)

Published 2023-05-23 · 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:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.005 (42.9th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 43rd percentile — 42.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

Cybozu Garoon
Cybozu, Inc. Cybozu Garoon — versions 4.10.0 to 5.9.2

Weakness classification (CWE)

CWE-400 — Uncontrolled Resource Consumption

References

cs.cybozu.co.jp/2023/007698.html (Vendor Advisory)
jvn.jp/en/jp/JVN41694426/ (Third Party Advisory)

Frequently asked questions

What is CVE-2023-26595?: CVE-2023-26595 is a medium-severity vulnerability in Cybozu Garoon, classified under Uncontrolled Resource Consumption. CVSS score: 6.5/10. Published 2023-05-23.
How severe is CVE-2023-26595?: Medium severity. CVSS v3 base score is 6.5 out of 10.