# CVE-2026-55186: Silverstripe MFA: Can bypass MFA during password reset flow

Status: published. Published: 2026-11-03. Updated: 2026-11-03.

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.

## Remediation

- fix: silverstripe/mfa (Packagist): OSV reports a fixed version 6.0.0. Check the advisory for supported release branches. (source: OSV GHSA-68wq-phq7-p2vg) — https://github.com/advisories/GHSA-68wq-phq7-p2vg

## Affected products and versions

- silverstripe / silverstripe-mfa: < 6.0.0 (affected). Source: CNA: GitHub_M
-  / silverstripe/mfa (silverstripe/mfa): 3.0.0 (affected, Packagist); 3.0.0-rc1 (affected, Packagist); 3.0.1 (affected, Packagist); 4.0.0 (affected, Packagist); 4.0.0-beta1 (affected, Packagist); 4.0.0-beta2 (affected, Packagist); 4.0.0-beta3 (affected, Packagist); 4.0.0-beta4 (affected, Packagist); 4.0.0-rc1 (affected, Packagist); 4.0.0-rc2 (affected, Packagist); 4.0.1 (affected, Packagist); 4.0.2 (affected, Packagist); 4.0.3 (affected, Packagist); 4.0.4 (affected, Packagist); 4.0.5 (affected, Packagist); 4.0.6 (affected, Packagist); 4.1.0 (affected, Packagist); 4.1.1 (affected, Packagist); 4.2.0 (affected, Packagist); 4.2.1 (affected, Packagist); 4.2.2 (affected, Packagist); 4.3.0 (affected, Packagist); 4.3.0-beta1 (affected, Packagist); 4.3.0-rc1 (affected, Packagist); 4.4.0 (affected, Packagist); 4.4.0-alpha1 (affected, Packagist); 4.4.0-beta1 (affected, Packagist); 4.4.0-rc1 (affected, Packagist); 4.5.0 (affected, Packagist); 4.5.1 (affected, Packagist); 4.6.1 (affected, Packagist); 4.6.2 (affected, Packagist); 4.6.3 (affected, Packagist); 4.7.0 (affected, Packagist); 4.7.0-beta1 (affected, Packagist); 4.7.0-rc1 (affected, Packagist); 4.8.0 (affected, Packagist); 4.8.0-beta1 (affected, Packagist); 4.8.0-rc1 (affected, Packagist); 4.8.1 (affected, Packagist); 4.8.2 (affected, Packagist); 4.8.3 (affected, Packagist); 5.0.0 (affected, Packagist); 5.0.0-beta1 (affected, Packagist); 5.0.0-beta2 (affected, Packagist); 5.0.0-rc1 (affected, Packagist); 5.0.1 (affected, Packagist); 5.1.0 (affected, Packagist); 5.1.0-beta1 (affected, Packagist); 5.1.0-rc1 (affected, Packagist); 5.1.1 (affected, Packagist); 5.2.0 (affected, Packagist); 5.2.0-beta1 (affected, Packagist); 5.2.0-rc1 (affected, Packagist); 5.2.1 (affected, Packagist); 5.2.2 (affected, Packagist); 5.2.3 (affected, Packagist); 5.2.4 (affected, Packagist); 5.3.0 (affected, Packagist); 5.3.0-beta1 (affected, Packagist); 5.3.0-rc1 (affected, Packagist); 5.3.1 (affected, Packagist); 5.4.0 (affected, Packagist); 5.4.0-beta1 (affected, Packagist); 5.4.0-rc1 (affected, Packagist); 5.4.1 (affected, Packagist); 5.4.2 (affected, Packagist); 5.4.3 (affected, Packagist); 5.4.4 (affected, Packagist); 6.0.0-alpha1 (affected, Packagist); 6.0.0-beta1 (affected, Packagist); 6.0.0-rc1 (affected, Packagist); Ecosystem version events: introduced 0; fixed 6.0.0. Source: OSV GHSA-68wq-phq7-p2vg

## Severity and prioritization

- CVSS 3.1: 4.2 (medium); CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N; source: CNA: GitHub_M

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-288

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/silverstripe/silverstripe-mfa/security/advisories/GHSA-68wq-phq7-p2vg (CNA: GitHub_M; x_refsource_CONFIRM)

- https://github.com/silverstripe/silverstripe-framework/pull/11686 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/silverstripe/silverstripe-mfa/pull/603 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/silverstripe/silverstripe-framework/commit/4b5cbd7ddf68721d8119583f0b9c04d4b4adc704 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/silverstripe/silverstripe-mfa/commit/04a102b662ac2f555acc26f8d2e2d8dab3937a6a (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/silverstripe/silverstripe-mfa/releases/tag/6.0.0 (CNA: GitHub_M; x_refsource_MISC)

- https://www.silverstripe.org/download/security-releases/cve-2026-55186 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/advisories/GHSA-68wq-phq7-p2vg (OSV / GitHub Security Advisories; advisory)

- https://osv.dev/vulnerability/GHSA-68wq-phq7-p2vg (OSV / GitHub Security Advisories; osv)

## Provenance

- CNA: GitHub_M: https://www.cve.org/CVERecord?id=CVE-2026-55186; retrieved 2026-11-03; source updated 2026-11-03

- OSV / GitHub Security Advisories: https://osv.dev/vulnerability/GHSA-68wq-phq7-p2vg; retrieved 2026-11-03; source updated 2026-11-03

Revision: 425f09f559b8d0cea8e725a85f63ec4b2f2c5e00e5088e8427da9a115288eef1

Canonical: https://y2.dev/cve/CVE-2026-55186

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