What is CVE-2020-16263?

CVE-2020-16263 is a critical-severity vulnerability in Winstonprivacy Winston, classified under Exposure of Resource to Wrong Sphere. CVSS score: 9.1/10. Published 2020-10-28.

How severe is CVE-2020-16263?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Vulnerability in Winstonprivacy Winston

CVE-2020-16263

Winston 1.5.4 devices have a CORS configuration that trusts arbitrary origins. This allows requests to be made and viewed by arbitrary origins.

Published 2020-10-28 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.012 (67.2th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 67th percentile — 67.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000

Affected products

Winstonprivacy Winston
Winstonprivacy Winston Firmware — versions 1.5.4

Weakness classification (CWE)

CWE-668 — Exposure of Resource to Wrong Sphere

References

winstonprivacy.com/ (Product)
labs.bishopfox.com/advisories/winston-privacy-version-1.5.4 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2020-16263?: CVE-2020-16263 is a critical-severity vulnerability in Winstonprivacy Winston, classified under Exposure of Resource to Wrong Sphere. CVSS score: 9.1/10. Published 2020-10-28.
How severe is CVE-2020-16263?: Critical severity. CVSS v3 base score is 9.1 out of 10.