What is CVE-2018-6506?

CVE-2018-6506 is a medium-severity vulnerability in Minibb, classified under Cross-site Scripting. CVSS score: 4.8/10. Published 2018-02-12.

How severe is CVE-2018-6506?

Medium severity. CVSS v3 base score is 4.8 out of 10.

XSS in Minibb

CVE-2018-6506

Cross-Site Scripting (XSS) exists in the Add Forum feature in the Administrative Panel in miniBB 3.2.2 via crafted use of an onload attribute of an SVG element in the supertitle field.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2018-02-12 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.005 (42.6th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 43rd percentile — 42.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

Minibb — versions 3.2.2

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

offensivehacking.wordpress.com/2018/02/07/minibb-forums-v3-2-2-stored-xss/ (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2018-6506?: CVE-2018-6506 is a medium-severity vulnerability in Minibb, classified under Cross-site Scripting. CVSS score: 4.8/10. Published 2018-02-12.
How severe is CVE-2018-6506?: Medium severity. CVSS v3 base score is 4.8 out of 10.