What is CVE-2018-9326?

CVE-2018-9326 is a critical-severity vulnerability in Etherpad. CVSS score: 9.8/10. Published 2018-04-07.

How severe is CVE-2018-9326?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Etherpad

CVE-2018-9326

Etherpad 1.6.3 before 1.6.4 allows an attacker to execute arbitrary code.

Published 2018-04-07 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.020 (79.5th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 80th percentile — 79.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.020 · newest: 0.020 · change: -0.000

Affected products

Etherpad — versions 1.6.3

References

blog.etherpad.org/2018/04/07/important-release-1-6-4/ (Vendor Advisory)

Frequently asked questions

What is CVE-2018-9326?: CVE-2018-9326 is a critical-severity vulnerability in Etherpad. CVSS score: 9.8/10. Published 2018-04-07.
How severe is CVE-2018-9326?: Critical severity. CVSS v3 base score is 9.8 out of 10.