What is CVE-2020-23426?

CVE-2020-23426 is a critical-severity vulnerability in Zzcms, classified under Cross-Site Request Forgery (CSRF). CVSS score: 9.8/10. Published 2021-04-08.

How severe is CVE-2020-23426?

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

Is CVE-2020-23426 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

CSRF in Zzcms

CVE-2020-23426

zzcms 201910 contains an access control vulnerability through escalation of privileges in /user/adv.php, which allows an attacker to modify data for further attacks such as CSRF.

Vulnerability class: CSRF (Cross-Site Request Forgery)

Published 2021-04-08 · 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: 0.037 (89.4th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 89th percentile — 89.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.037 · newest: 0.037 · change: 0.000

Affected products

Zzcms — versions 201910

Weakness classification (CWE)

CWE-352 — Cross-Site Request Forgery (CSRF)

Public proof-of-concept exploits

References

github.com/Ling-Yizhou/zzcms-vuln/blob/master/Privilege Escalation/priviege esc… (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2020-23426?: CVE-2020-23426 is a critical-severity vulnerability in Zzcms, classified under Cross-Site Request Forgery (CSRF). CVSS score: 9.8/10. Published 2021-04-08.
How severe is CVE-2020-23426?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2020-23426 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.