CVE-2026-55186

Description

Silverstripe MFA provides multi-factor authentication for Silverstripe CMS. Prior to 6.0.0, the CMS 5 password reset flow can issue a logged-in session after a user changes a password but before the user's configured multi-factor authentication challenge is completed. An attacker with access to the user's email account can follow the reset flow and bypass the additional authentication factor. CMS 6 is not affected. This issue is fixed in version 6.0.0.

References

• https://github.com/silverstripe/silverstripe-framework/commit/4b5cbd7ddf68721d8119583f0b9c04d4b4adc704
• https://github.com/silverstripe/silverstripe-framework/pull/11686
• https://github.com/silverstripe/silverstripe-mfa/commit/04a102b662ac2f555acc26f8d2e2d8dab3937a6a
• https://github.com/silverstripe/silverstripe-mfa/pull/603
• https://github.com/silverstripe/silverstripe-mfa/releases/tag/6.0.0