Improper Session Invalidation after Authentication Credential Change vulnerability in team-alembic…

Why it is Yellow

• CVSS 6.3 medium

References

• https://cna.erlef.org/cves/CVE-2026-110826.html
• https://github.com/team-alembic/ash_authentication/commit/0993f944fbd8d668f941d2ca818da4a1d5917641
• https://github.com/team-alembic/ash_authentication/commit/2baef4eddeb604569d3564273d03eeef438e002c
• https://github.com/team-alembic/ash_authentication/commit/954697f168d55112b5050acddcd936b8bc1fba2b
• https://github.com/team-alembic/ash_authentication/security/advisories/GHSA-j6f8-qcj9-gh4r
• https://osv.dev/vulnerability/EEF-CVE-2026-110826

Original description

Improper Session Invalidation after Authentication Credential Change vulnerability in team-alembic ash_authentication allows an attacker holding a victim's session token to stay signed in after the victim resets or changes their password. With apply_on_password_change? true, AshAuthentication.AddOn.LogOutEverywhere.Transformer adds OnPasswordChange to update actions as a global change guarded by where: changing(hashed_password). That condition is evaluated before the action's before_action hooks run, but AshAuthentication.Strategy.Password.HashPasswordChange sets the new hash in a before_action hook, so for every non-atomic password change the condition is false and the user's stored tokens are not revoked. The generated password reset action and the installer's change_password action are both non-atomic. This issue affects ash_authentication: from 4.5.0 before 4.15.1 and from 5.0.0-rc.0 before 5.0.0-rc.16.