CVE-2026-86522

01/Description

Improper Output Neutralization for Logs vulnerability in team-alembic AshAuthentication allows an unauthenticated attacker to forge application log entries by submitting a password reset identity containing newlines or control characters. AshAuthentication.Strategy.Password.RequestPasswordReset.run/3 interpolates the identity argument, the email or username taken straight from the reset request, into its Logger.warning/1 heredocs without escaping, truncating or type-restricting it. The resource logged beside it is passed through inspect/1, which would have neutralized the value. A newline in the identity therefore ends the log record, and everything after it is written as a line of its own, so an attacker chooses the severity tag and the content of entries that appear to have come from the application. This issue affects ash_authentication: from 4.2.0 before 4.15.0 and from 5.0.0-rc.0 before 5.0.0-rc.14.

02/References6

• cna.erlef.org/cves/CVE-2026-86522.html
• github.com/team-alembic/ash_authentication/commit/3954f27792971…
• github.com/team-alembic/ash_authentication/commit/57c7cc3236bef…
• github.com/team-alembic/ash_authentication/commit/fd19358bf0eee…
• github.com/team-alembic/ash_authentication/security/advisories/…
• osv.dev/vulnerability/EEF-CVE-2026-86522