What is CVE-2018-18635?

CVE-2018-18635 is a medium-severity vulnerability in Mailcleaner, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2018-10-24.

How severe is CVE-2018-18635?

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

XSS in Mailcleaner

CVE-2018-18635

www/guis/admin/application/controllers/UserController.php in the administration login interface in MailCleaner CE 2018.08 and 2018.09 allows XSS via the admin/login/user/message/ PATH_INFO.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2018-10-24 · 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: 0.009 (59.6th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 60th percentile — 59.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

Mailcleaner — versions 2018.08, 2018.09

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

github.com/MailCleaner/MailCleaner/issues/53 (Exploit, Patch, Third Party Advisory)
github.com/MailCleaner/MailCleaner/commit/5f90a52785672fc688c1f85e472e84b8a0d00… (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2018-18635?: CVE-2018-18635 is a medium-severity vulnerability in Mailcleaner, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2018-10-24.
How severe is CVE-2018-18635?: Medium severity. CVSS v3 base score is 6.1 out of 10.