What is CVE-2018-20422?

CVE-2018-20422 is a high-severity vulnerability in Comsenz Discuzx, classified under Improper Authentication. CVSS score: 8.1/10. Published 2018-12-24.

How severe is CVE-2018-20422?

High severity. CVSS v3 base score is 8.1 out of 10.

Auth bypass in Comsenz Discuzx

CVE-2018-20422

Discuz! DiscuzX 3.4, when WeChat login is enabled, allows remote attackers to bypass authentication by leveraging a non-empty #wechat#common_member_wechatmp to gain login access to an account via a plugin.php ac=wxregister request (the attacker does not have control over which account will be accessed).

Vulnerability class: Broken Authentication

Published 2018-12-24 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.013 (69.2th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 69th percentile — 69.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: 0.000

Affected products

Comsenz Discuzx — versions x3.4

Weakness classification (CWE)

CWE-287 — Improper Authentication

References

gitee.com/ComsenzDiscuz/DiscuzX/issues/IPRUI (Exploit, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2018-20422?: CVE-2018-20422 is a high-severity vulnerability in Comsenz Discuzx, classified under Improper Authentication. CVSS score: 8.1/10. Published 2018-12-24.
How severe is CVE-2018-20422?: High severity. CVSS v3 base score is 8.1 out of 10.