What is CVE-2020-18766?

CVE-2020-18766 is a critical-severity vulnerability in Antsword Project, classified under Cross-site Scripting. CVSS score: 9.6/10. Published 2020-10-26.

How severe is CVE-2020-18766?

Critical severity. CVSS v3 base score is 9.6 out of 10.

XSS in Antsword Project

CVE-2020-18766

A cross-site scripting (XSS) vulnerability AntSword v2.0.7 can remotely execute system commands.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2020-10-26 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.6 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.012 (65.9th percentile), scored 2026-10-03.

Low probability of exploitation in the next 30 days, but still tracked. 66th percentile — 65.9% 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

Antsword Project — versions 2.0.7

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

github.com/AntSwordProject/antSword/issues/147 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2020-18766?: CVE-2020-18766 is a critical-severity vulnerability in Antsword Project, classified under Cross-site Scripting. CVSS score: 9.6/10. Published 2020-10-26.
How severe is CVE-2020-18766?: Critical severity. CVSS v3 base score is 9.6 out of 10.