What is CVE-2018-18380?

CVE-2018-18380 is a medium-severity vulnerability in Bigtreecms Bigtree Cms, classified under Session Fixation. CVSS score: 5.4/10. Published 2018-10-19.

How severe is CVE-2018-18380?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Vulnerability in Bigtreecms Bigtree Cms

CVE-2018-18380

A Session Fixation issue was discovered in Bigtree before 4.2.24. admin.php accepts a user-provided PHP session ID instead of regenerating a new one after a user has logged in to the application. The Session Fixation could allow an attacker to hijack an admin session.

Published 2018-10-19 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.011 (63.9th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 64th percentile — 63.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000

Affected products

Bigtreecms Bigtree Cms

Weakness classification (CWE)

CWE-384 — Session Fixation

References

gist.github.com/zionspike/680eb504db7c86296fad0eff30c6317f (Patch, Third Party Advisory)
github.com/bigtreecms/BigTree-CMS/tree/4.2.24 (Release Notes)
github.com/bigtreecms/BigTree-CMS/commit/c69402c4764ed9a76301c57277aefe70141b64… (Patch)

Frequently asked questions

What is CVE-2018-18380?: CVE-2018-18380 is a medium-severity vulnerability in Bigtreecms Bigtree Cms, classified under Session Fixation. CVSS score: 5.4/10. Published 2018-10-19.
How severe is CVE-2018-18380?: Medium severity. CVSS v3 base score is 5.4 out of 10.