What is CVE-2018-18783?

CVE-2018-18783 is a medium-severity vulnerability in Sem-Cms Semcms, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2018-10-29.

How severe is CVE-2018-18783?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Sem-Cms Semcms

CVE-2018-18783

XSS was discovered in SEMCMS V3.4 via the semcms_remail.php?type=ok umail parameter.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2018-10-29 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.008 (54.9th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 54.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

Sem-Cms Semcms — versions 3.4

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

github.com/m3lon/2018_Recorder/blob/master/SEMCMS DOM Based XSS.md (Broken Link)
exchange.xforce.ibmcloud.com/vulnerabilities/152197 (Third Party Advisory)

Frequently asked questions

What is CVE-2018-18783?: CVE-2018-18783 is a medium-severity vulnerability in Sem-Cms Semcms, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2018-10-29.
How severe is CVE-2018-18783?: Medium severity. CVSS v3 base score is 6.1 out of 10.