What is CVE-2019-5918?

CVE-2019-5918 is a critical-severity vulnerability in Nablarch Project, classified under Improper Restriction of XML External Entity Reference (XXE). CVSS score: 9.1/10. Published 2019-03-12.

How severe is CVE-2019-5918?

Critical severity. CVSS v3 base score is 9.1 out of 10.

XXE in Nablarch Project

CVE-2019-5918

Nablarch 5 (5, and 5u1 to 5u13) allows remote attackers to conduct XML External Entity (XXE) attacks via unspecified vectors.

Vulnerability class: XXE (XML External Entity)

Published 2019-03-12 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H.

EPSS exploit prediction

EPSS: 0.019 (78.4th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 78th percentile — 78.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.019 · newest: 0.019 · change: 0.000

Affected products

Nablarch Project — versions 5, 5u1, 5u13
Tis Inc. Nablarch 5 — versions Nablarch 5, and 5u1 to 5u13

Weakness classification (CWE)

CWE-611 — Improper Restriction of XML External Entity Reference (XXE)

References

nablarch.atlassian.net/projects/NAB/issues/NAB-295 (Third Party Advisory)
jvn.jp/en/jp/JVN56542712/index.html (Third Party Advisory, third-party-advisory)

Frequently asked questions

What is CVE-2019-5918?: CVE-2019-5918 is a critical-severity vulnerability in Nablarch Project, classified under Improper Restriction of XML External Entity Reference (XXE). CVSS score: 9.1/10. Published 2019-03-12.
How severe is CVE-2019-5918?: Critical severity. CVSS v3 base score is 9.1 out of 10.