What is CVE-2020-23208?

CVE-2020-23208 is a medium-severity vulnerability in Phplist, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2021-07-01.

How severe is CVE-2020-23208?

Medium severity. CVSS v3 base score is 5.4 out of 10.

XSS in Phplist

CVE-2020-23208

A stored cross site scripting (XSS) vulnerability in phplist 3.5.3 allows attackers to execute arbitrary web scripts or HTML via a crafted payload entered into the "Send test" field under the "Start or continue campaign" module.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2021-07-01 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.006 (43.9th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 44th percentile — 43.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Phplist — versions 3.5.3

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

github.com/phpList/phplist3/issues/665 (Exploit, Patch, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2020-23208?: CVE-2020-23208 is a medium-severity vulnerability in Phplist, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2021-07-01.
How severe is CVE-2020-23208?: Medium severity. CVSS v3 base score is 5.4 out of 10.