What is CVE-2020-13827?

CVE-2020-13827 is a medium-severity vulnerability in Phplist, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2020-06-04.

How severe is CVE-2020-13827?

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

XSS in Phplist

CVE-2020-13827

phpList before 3.5.4 allows XSS via /lists/admin/user.php and /lists/admin/users.php.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2020-06-04 · last modified 2026-06-17.

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 (56.5th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 56th percentile — 56.5% 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

Phplist

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

www.phplist.org/newslist/phplist-3-5-4-release-notes/ (Release Notes)
www.wizlynxgroup.com/security-research-advisories/vuln/WLX-2020-004 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2020-13827?: CVE-2020-13827 is a medium-severity vulnerability in Phplist, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2020-06-04.
How severe is CVE-2020-13827?: Medium severity. CVSS v3 base score is 6.1 out of 10.