Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
The omniauth-apple RubyGems package, versions before 1.0.1, lets an attacker set the info.email value during Apple sign-in to any value they choose, including another user's email address. This affects applications that use info.email to identify users; applications that identify users by uid are not affected in the same way. Upgrade to omniauth-apple 1.0.1 or later.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 7.7 | High | 3.1 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.013, the 71st percentile, on 9 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 15:16 UTC First seen by agentprime
- 31 Oct 2026, 15:16 UTC Confirmed by OSV
Sources
- GitHub Advisory Database: GHSA-49r3-2549-3633
- OSV: GHSA-49r3-2549-3633
- github.com/nhosoya/omniauth-apple/security/advisories/GHSA-49r3-2549-3633
- nvd.nist.gov/vuln/detail/CVE-2020-26254
- github.com/nhosoya/omniauth-apple/commit/b37d5409213adae2ca06a67fec14c8d3d07d9016
- github.com/nhosoya/omniauth-apple
- github.com/nhosoya/omniauth-apple/blob/master/CHANGELOG.md#101---2020-12-03
- github.com/rubysec/ruby-advisory-db/blob/master/gems/omniauth-apple/CVE-2020-26254.yml