What is CVE-2020-23361?

CVE-2020-23361 is a critical-severity vulnerability in Phplist. CVSS score: 9.8/10. Published 2021-01-27.

How severe is CVE-2020-23361?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Phplist

CVE-2020-23361

phpList 3.5.3 allows type juggling for login bypass because == is used instead of === for password hashes, which mishandles hashes that begin with 0e followed by exclusively numerical characters.

Published 2021-01-27 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.012 (67.2th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 67th percentile — 67.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000

Affected products

Phplist — versions 3.5.3

References

github.com/phpList/phplist3/issues/668 (Exploit, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2020-23361?: CVE-2020-23361 is a critical-severity vulnerability in Phplist. CVSS score: 9.8/10. Published 2021-01-27.
How severe is CVE-2020-23361?: Critical severity. CVSS v3 base score is 9.8 out of 10.