What is CVE-2013-4593?

CVE-2013-4593 is a high-severity vulnerability in Omniauth-Facebook, classified under Improper Authentication. CVSS score: 7.5/10. Published 2019-12-11.

How severe is CVE-2013-4593?

High severity. CVSS v3 base score is 7.5 out of 10.

Auth bypass in Omniauth-Facebook

CVE-2013-4593

RubyGem omniauth-facebook has an access token security vulnerability

Vulnerability class: Broken Authentication

Published 2019-12-11 · last modified 2026-06-16.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.018 (77.0th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 77th percentile — 77.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.018 · newest: 0.018 · change: 0.000

Affected products

Omniauth-Facebook — versions <= 1.5.0
Omniauth-Facebook Project

Weakness classification (CWE)

CWE-287 — Improper Authentication

References

security-tracker.debian.org/tracker/CVE-2013-4593 (Third Party Advisory)
access.redhat.com/security/cve/cve-2013-4593 (Broken Link)
www.openwall.com/lists/oss-security/2013/11/18/6 (Patch, Mailing List, Third Party Advisory)
exchange.xforce.ibmcloud.com/vulnerabilities/89040 (VDB Entry, Third Party Advisory)

Frequently asked questions

What is CVE-2013-4593?: CVE-2013-4593 is a high-severity vulnerability in Omniauth-Facebook, classified under Improper Authentication. CVSS score: 7.5/10. Published 2019-12-11.
How severe is CVE-2013-4593?: High severity. CVSS v3 base score is 7.5 out of 10.