What is CVE-2020-23178?

CVE-2020-23178 is a medium-severity vulnerability in Php-Fusion, classified under Authentication Bypass by Capture-replay. CVSS score: 5.4/10. Published 2021-07-02.

How severe is CVE-2020-23178?

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

Vulnerability in Php-Fusion

CVE-2020-23178

An issue exists in PHP-Fusion 9.03.50 where session cookies are not deleted once a user logs out, allowing for an attacker to perform a session replay attack and impersonate the victim user.

Published 2021-07-02 · 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:N/S:U/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.005 (42.2th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 42nd percentile — 42.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

Php-Fusion — versions 9.03.50

Weakness classification (CWE)

CWE-294 — Authentication Bypass by Capture-replay

References

github.com/PHPFusion/PHPFusion/issues/2314 (Exploit, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2020-23178?: CVE-2020-23178 is a medium-severity vulnerability in Php-Fusion, classified under Authentication Bypass by Capture-replay. CVSS score: 5.4/10. Published 2021-07-02.
How severe is CVE-2020-23178?: Medium severity. CVSS v3 base score is 5.4 out of 10.