What is CVE-2018-20322?

CVE-2018-20322 is a medium-severity vulnerability in Limesurvey, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2018-12-21.

How severe is CVE-2018-20322?

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

XSS in Limesurvey

CVE-2018-20322

LimeSurvey version 3.15.5 contains a Cross-site scripting (XSS) vulnerability in Survey Resource zip upload, resulting in Javascript code execution against LimeSurvey administrators. Fixed in version 3.15.6.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2018-12-21 · 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 (64.7th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 65th percentile — 64.7% 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

Limesurvey

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

github.com/LimeSurvey/LimeSurvey/commit/bfee69edaa0b90f97dc2d8fab09a87958cb32405 (Patch, Third Party Advisory)
bugs.limesurvey.org/view.php (Permissions Required, Issue Tracking, Vendor Advisory)

Frequently asked questions

What is CVE-2018-20322?: CVE-2018-20322 is a medium-severity vulnerability in Limesurvey, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2018-12-21.
How severe is CVE-2018-20322?: Medium severity. CVSS v3 base score is 6.1 out of 10.