CVE-2026-55954
Auth bypass in ueberauth_apple allows account takeover via unvalidated Apple ID tokens
Is CVE-2026-55954 being exploited?
Not confirmed. CVE-2026-55954 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.70% probability of exploitation in the next 30 days.
How severe is CVE-2026-55954?
CVE-2026-55954 is rated Critical with a CVSS score of 9.1. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-55954?
Yes. A fix has been recorded for CVE-2026-55954. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-55954 affect?
CVE-2026-55954 affects ueberauth_apple < 0.6.2, Elixir/Phoenix apps using Ueberauth Apple strategy. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-55954?
Upgrade to ueberauth_apple >=0.6.2 and validate iss/aud/exp claims
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Account takeover: attackers can replay Apple-signed id_tokens (no exp/aud checks) to authenticate as victims, enabling unauthorized access to user accounts.
Immediate action required
- affected>= 0.1.0 and < 0.6.2
- affected>= 3908a187d045c75994b62ce340c3aa26bb8976b8 and < 01e2d9c9b3134e1b78633ad82d136d5ff4a61f28
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.