What is CVE-2011-1009?

CVE-2011-1009 is a medium-severity vulnerability in Vanilla Forums, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2020-02-05.

How severe is CVE-2011-1009?

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

XSS in Vanilla Forums

CVE-2011-1009

Vanilla Forums 2.0.17.1 through 2.0.17.5 has XSS in /vanilla/index.php via the p parameter.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2020-02-05 · last modified 2026-06-16.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.008 (55.0th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 55.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

Vanilla Forums — versions 2.0.17.1 through 2.0.17.5
Vanillaforums Vanilla

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

www.openwall.com/lists/oss-security/2011/02/22/14 (Exploit, Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2011-1009?: CVE-2011-1009 is a medium-severity vulnerability in Vanilla Forums, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2020-02-05.
How severe is CVE-2011-1009?: Medium severity. CVSS v3 base score is 6.1 out of 10.