What is CVE-2018-15581?

CVE-2018-15581 is a medium-severity vulnerability in Sir Gnuboard, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2019-04-26.

How severe is CVE-2018-15581?

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

XSS in Sir Gnuboard

CVE-2018-15581

Cross-Site Scripting (XSS) vulnerability in adm/faqmasterformupdate.php in gnuboard5 before 5.3.1.6 allows remote attackers to inject arbitrary web script or HTML.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2019-04-26 · 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: 0.011 (63.2th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 63rd percentile — 63.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000

Affected products

Sir Gnuboard

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

github.com/gnuboard/gnuboard5/commit/b1fc952c7600b825c4b02e2789ddafdea18c8d13 (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2018-15581?: CVE-2018-15581 is a medium-severity vulnerability in Sir Gnuboard, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2019-04-26.
How severe is CVE-2018-15581?: Medium severity. CVSS v3 base score is 6.1 out of 10.