What is CVE-2017-20033?

CVE-2017-20033 is a medium-severity vulnerability in Phplist, classified under Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS). CVSS score: 4.3/10. Published 2022-06-10.

How severe is CVE-2017-20033?

Medium severity. CVSS v3 base score is 4.3 out of 10.

XSS in Phplist

CVE-2017-20033

A vulnerability classified as problematic has been found in PHPList 3.2.6. This affects an unknown part of the file /lists/admin/. The manipulation of the argument page with the input send\'\";><script>alert(8)</script> leads to cross site scripting (Reflected). It is possible to initiate the attack remotely. Upgrading to version 3.3.1 is able to address this issue. It is recommended to upgrade the affected component.

Published 2022-06-10 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.007 (53.1th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 53rd percentile — 53.1% 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 — versions 3.2.6
Unspecified Phplist — versions 3.2.6

Weakness classification (CWE)

References

seclists.org/fulldisclosure/2017/Mar/46 (Exploit, Mailing List, Third Party Advisory)
vuldb.com/ (Third Party Advisory)

Frequently asked questions

What is CVE-2017-20033?: CVE-2017-20033 is a medium-severity vulnerability in Phplist, classified under Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS). CVSS score: 4.3/10. Published 2022-06-10.
How severe is CVE-2017-20033?: Medium severity. CVSS v3 base score is 4.3 out of 10.