What is CVE-2018-15493?

CVE-2018-15493 is a medium-severity vulnerability in Vbulletin, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 6.1/10. Published 2018-10-17.

How severe is CVE-2018-15493?

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

Open Redirect in Vbulletin

CVE-2018-15493

vBulletin 5.4.3 has an Open Redirect.

Vulnerability class: Open Redirect

Published 2018-10-17 · 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: 0.007 (49.5th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 49th percentile — 49.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Vbulletin — versions 5.4.3

Weakness classification (CWE)

CWE-601 — URL Redirection to Untrusted Site (Open Redirect)

References

www.syss.de/fileadmin/dokumente/Publikationen/Advisories/SYSS-2018-017.txt (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2018-15493?: CVE-2018-15493 is a medium-severity vulnerability in Vbulletin, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 6.1/10. Published 2018-10-17.
How severe is CVE-2018-15493?: Medium severity. CVSS v3 base score is 6.1 out of 10.