What is CVE-2020-12639?

CVE-2020-12639 is a medium-severity vulnerability in Phplist, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2020-05-04.

How severe is CVE-2020-12639?

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

XSS in Phplist

CVE-2020-12639

phpList before 3.5.3 allows XSS, with resultant privilege elevation, via lists/admin/template.php.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2020-05-04 · 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: 0.007 (51.2th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 51st percentile — 51.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Phplist

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

www.phplist.org/newslist/phplist-3-5-3-release-notes/ (Release Notes, Vendor Advisory)
github.com/phpList/phplist3/compare/3.5.2...3.5.3 (Third Party Advisory, Release Notes)

Frequently asked questions

What is CVE-2020-12639?: CVE-2020-12639 is a medium-severity vulnerability in Phplist, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2020-05-04.
How severe is CVE-2020-12639?: Medium severity. CVSS v3 base score is 6.1 out of 10.