What is CVE-2018-18668?

CVE-2018-18668 is a medium-severity vulnerability in Sir Gnuboard, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2019-08-26.

How severe is CVE-2018-18668?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Sir Gnuboard

CVE-2018-18668

GNUBOARD5 before 5.3.2.0 has XSS that allows remote attackers to inject arbitrary web script or HTML via the "homepage title" parameter, aka the adm/config_form_update.php cf_title parameter.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2019-08-26 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.014 (72.2th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 72nd percentile — 72.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.014 · newest: 0.014 · change: 0.000

Affected products

Sir Gnuboard

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

github.com/gnuboard/gnuboard5/compare/15b2e73...2549172 (Patch)
github.com/gnuboard/gnuboard5/commit/a45241f4bc46aee1ab2cc0749f6444b043681edf (Patch)
github.com/gnuboard/gnuboard5/releases/tag/5.3.2.0 (Release Notes)

Frequently asked questions

What is CVE-2018-18668?: CVE-2018-18668 is a medium-severity vulnerability in Sir Gnuboard, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2019-08-26.
How severe is CVE-2018-18668?: Medium severity. CVSS v3 base score is 6.1 out of 10.