What is CVE-2018-18426?

CVE-2018-18426 is a high-severity vulnerability in S-Cms, classified under Code Injection. CVSS score: 8.8/10. Published 2018-10-17.

How severe is CVE-2018-18426?

High severity. CVSS v3 base score is 8.8 out of 10.

RCE in S-Cms

CVE-2018-18426

s-cms 3.0 allows remote attackers to execute arbitrary PHP code by placing this code in a crafted User-agent Disallow value in the robots.php txt parameter.

Vulnerability class: RCE (Remote Code Execution)

Published 2018-10-17 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.024 (83.7th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 84th percentile — 83.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.024 · newest: 0.024 · change: 0.000

Affected products

S-Cms — versions 3.0

Weakness classification (CWE)

CWE-94 — Code Injection

References

www.s-cms.cn/update.html (Vendor Advisory)
www.ttk7.cn/post-93.html (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2018-18426?: CVE-2018-18426 is a high-severity vulnerability in S-Cms, classified under Code Injection. CVSS score: 8.8/10. Published 2018-10-17.
How severe is CVE-2018-18426?: High severity. CVSS v3 base score is 8.8 out of 10.