What is CVE-2018-5377?

CVE-2018-5377 is a critical-severity vulnerability in Discuz Discuzx, classified under Missing Authorization. CVSS score: 9.8/10. Published 2018-01-12.

How severe is CVE-2018-5377?

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

Auth bypass in Discuz Discuzx

CVE-2018-5377

Discuz! DiscuzX X3.4 allows remote attackers to bypass intended access restrictions via the archiver\index.php action parameter.

Vulnerability class: Broken Access Control

Published 2018-01-12 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.021 (80.9th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 81st percentile — 80.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.021 · newest: 0.021 · change: 0.000

Affected products

Discuz Discuzx — versions x3.4

Weakness classification (CWE)

CWE-862 — Missing Authorization

References

www.whsgwl.net/text.php (Third Party Advisory)

Frequently asked questions

What is CVE-2018-5377?: CVE-2018-5377 is a critical-severity vulnerability in Discuz Discuzx, classified under Missing Authorization. CVSS score: 9.8/10. Published 2018-01-12.
How severe is CVE-2018-5377?: Critical severity. CVSS v3 base score is 9.8 out of 10.