What is CVE-2018-1000548?

CVE-2018-1000548 is a high-severity vulnerability in Umlet, classified under Improper Restriction of XML External Entity Reference (XXE). CVSS score: 7.8/10. Published 2018-06-26.

How severe is CVE-2018-1000548?

High severity. CVSS v3 base score is 7.8 out of 10.

XXE in Umlet

CVE-2018-1000548

Umlet version < 14.3 contains a XML External Entity (XXE) vulnerability in File parsing that can result in disclosure of confidential data, denial of service, server side request forgery. This attack appear to be exploitable via Specially crafted UXF file. This vulnerability appears to have been fixed in 14.3.

Vulnerability class: XXE (XML External Entity)

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

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.013 (69.8th percentile), scored 2026-10-03.

Low probability of exploitation in the next 30 days, but still tracked. 70th percentile — 69.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: 0.000

Affected products

Umlet

Weakness classification (CWE)

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

References

github.com/umlet/umlet/issues/500 (Exploit, Third Party Advisory)
0dd.zone/2018/04/23/UMLet-XXE/ (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2018-1000548?: CVE-2018-1000548 is a high-severity vulnerability in Umlet, classified under Improper Restriction of XML External Entity Reference (XXE). CVSS score: 7.8/10. Published 2018-06-26.
How severe is CVE-2018-1000548?: High severity. CVSS v3 base score is 7.8 out of 10.