What is CVE-2024-31401?

CVE-2024-31401 is a critical-severity vulnerability in Cybozu Garoon, classified under Cross-site Scripting. CVSS score: 9.0/10. Published 2024-06-11.

How severe is CVE-2024-31401?

Critical severity. CVSS v3 base score is 9.0 out of 10.

Is CVE-2024-31401 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

XSS in Cybozu Garoon

CVE-2024-31401

Cross-site scripting vulnerability in Cybozu Garoon 5.0.0 to 5.15.2 allows a remote authenticated attacker with an administrative privilege to inject an arbitrary script on the web browser of the user who is logging in to the product.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2024-06-11 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.005 (40.6th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 41st percentile — 40.6% 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 5.0.0 to 5.15.2

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

ARPSyndicate/cve-scores

References

cs.cybozu.co.jp/2024/007901.html (Vendor Advisory)
jvn.jp/en/jp/JVN28869536/ (Third Party Advisory)

Frequently asked questions

What is CVE-2024-31401?: CVE-2024-31401 is a critical-severity vulnerability in Cybozu Garoon, classified under Cross-site Scripting. CVSS score: 9.0/10. Published 2024-06-11.
How severe is CVE-2024-31401?: Critical severity. CVSS v3 base score is 9.0 out of 10.
Is CVE-2024-31401 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.