What is CVE-2020-5640?

CVE-2020-5640 is a critical-severity vulnerability in Onethird. CVSS score: 9.8/10. Published 2020-10-20.

How severe is CVE-2020-5640?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Onethird

CVE-2020-5640

Local file inclusion vulnerability in OneThird CMS v1.96c and earlier allows a remote unauthenticated attacker to execute arbitrary code or obtain sensitive information via unspecified vectors.

Published 2020-10-20 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.025 (84.0th percentile), scored 2026-10-04.

Low probability of exploitation in the next 30 days, but still tracked. 84th percentile — 84.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.025 · newest: 0.025 · change: 0.000

Affected products

Onethird
Spiqe Software Onethird Cms — versions v1.96c and earlier

References

onethird.net/en/p1340.html (Vendor Advisory)
jvn.jp/en/vu/JVNVU99467898/index.html (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2020-5640?: CVE-2020-5640 is a critical-severity vulnerability in Onethird. CVSS score: 9.8/10. Published 2020-10-20.
How severe is CVE-2020-5640?: Critical severity. CVSS v3 base score is 9.8 out of 10.