What is CVE-2020-26254?

CVE-2020-26254 is a high-severity vulnerability in Nhosoya Omniauth-Apple, classified under Authentication Bypass by Spoofing. CVSS score: 7.7/10. Published 2020-12-08.

How severe is CVE-2020-26254?

High severity. CVSS v3 base score is 7.7 out of 10.

Vulnerability in Nhosoya Omniauth-Apple

CVE-2020-26254

omniauth-apple is the OmniAuth strategy for "Sign In with Apple" (RubyGem omniauth-apple). In omniauth-apple before version 1.0.1 attackers can fake their email address during authentication. This vulnerability impacts applications using the omniauth-apple strategy of OmniAuth and using the info.email field of OmniAuth's Auth Hash Schema for any kind of identification. The value of this field may be set to any value of the attacker's choice including email addresses of other users. Applications not using info.email for identification but are instead using the uid field are not impacted in the same manner. Note, these applications may still be negatively affected if the value of info.email is being used for other purposes. Applications using affected versions of omniauth-apple are advised to upgrade to omniauth-apple version 1.0.1 or later.

Published 2020-12-08 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.7 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.013 (70.2th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 70th percentile — 70.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: +0.000

Affected products

Nhosoya Omniauth-Apple — versions < 1.0.1
Omniauth-Apple Project

Weakness classification (CWE)

CWE-290 — Authentication Bypass by Spoofing

References

github.com/nhosoya/omniauth-apple/security/advisories/GHSA-49r3-2549-3633 (Exploit, Third Party Advisory, Mitigation)
github.com/nhosoya/omniauth-apple/commit/b37d5409213adae2ca06a67fec14c8d3d07d90… (Patch, Third Party Advisory)
github.com/nhosoya/omniauth-apple/blob/master/CHANGELOG.md (Third Party Advisory, Release Notes)

Frequently asked questions

What is CVE-2020-26254?: CVE-2020-26254 is a high-severity vulnerability in Nhosoya Omniauth-Apple, classified under Authentication Bypass by Spoofing. CVSS score: 7.7/10. Published 2020-12-08.
How severe is CVE-2020-26254?: High severity. CVSS v3 base score is 7.7 out of 10.