What is CVE-2018-18737?

CVE-2018-18737 is a high-severity vulnerability in Douchat, classified under Improper Restriction of XML External Entity Reference (XXE). CVSS score: 7.5/10. Published 2018-10-29.

How severe is CVE-2018-18737?

High severity. CVSS v3 base score is 7.5 out of 10.

XXE in Douchat

CVE-2018-18737

An XXE issue was discovered in Douchat 4.0.4 because Data\notify.php calls simplexml_load_string. This can also be used for SSRF.

Vulnerability class: XXE (XML External Entity)

Published 2018-10-29 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.012 (67.0th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 67th percentile — 67.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000

Affected products

Douchat — versions 4.0.4

Weakness classification (CWE)

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

References

github.com/AvaterXXX/douchat/blob/master/xxe.md (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2018-18737?: CVE-2018-18737 is a high-severity vulnerability in Douchat, classified under Improper Restriction of XML External Entity Reference (XXE). CVSS score: 7.5/10. Published 2018-10-29.
How severe is CVE-2018-18737?: High severity. CVSS v3 base score is 7.5 out of 10.