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CVE-2018-20423

25
FAUCET Score

CVE-2018-20423 describes a high-severity vulnerability in Discuz! DiscuzX 3.4, specifically when WeChat login is enabled. This flaw allows remote attackers to bypass a "disabled registration" setting by manipulating the wxregister query string with a non-existent wxopenid value. The vulnerability has a CVSS score of 8.1 (HIGH), indicating a high potential for impact on confidentiality, integrity, and availability, with a low attack complexity and no user interaction required. Despite its severity, there is currently no evidence of active exploitation, publicly available exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
x3.4CPE matchmatch criteria
cpe:2.3:a:comsenz:discuzx:x3.4:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

8.1HIGH

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.2
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.18%
Probability of exploitation in next 30 days
EPSS Percentile
64.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0118 is in the 26th percentile among its peer group of 8,915 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

gitee.com / ComsenzDiscuz/DiscuzX/issues/IPRUI
ExploitIssue TrackingThird Party Advisory