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Medium, CVSS 4.2amended

MultiFactor Authentication for SilverStripe can bypass MFA during password reset flow

CVE-2026-55186GHSA-68wq-phq7-p2vg

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (silverstripe/mfa 6.0.0), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
4.2 · CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N
EPSS
No dated EPSS signal available.
Source description

As published by the source; long descriptions are shortened.

Impact In CMS 5, the password reset flow let a user with multi-factor authentication enabled change their password and get a logged-in session before completing multi-factor authentication. Exploiting this requires access to the user's email account. CMS 6 is not affected.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 4 · amended ·

    Amended from osv record GHSA-68wq-phq7-p2vg

  2. Revision 3 · amended ·

    Amended from ghsa record GHSA-68wq-phq7-p2vg

  3. Revision 2 · amended ·

    Amended from osv record GHSA-68wq-phq7-p2vg

  4. Revision 1 · created ·

    Published from ghsa record GHSA-68wq-phq7-p2vg

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2026-55186

Advisory: MultiFactor Authentication for SilverStripe can bypass MFA during password reset flow
IDs: CVE-2026-55186, GHSA-68wq-phq7-p2vg
Record: https://patchnext.com/advisories/cve-2026-55186 (revision 4, source checked 4 Nov 2026, 06:20 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 4.2)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: silverstripe/mfa 6.0.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist silverstripe/mfa: affected < 6.0.0; fixed in 6.0.0

## Suggested inspection (read-only)
- Packagist silverstripe/mfa: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on silverstripe/mfa.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-68wq-phq7-p2vg (GitHub-reviewed advisory GHSA-68wq-phq7-p2vg lists affected ranges: Packagist silverstripe/mfa >=0 <6.0.0)
- Verified: https://osv.dev/vulnerability/GHSA-68wq-phq7-p2vg (OSV record GHSA-68wq-phq7-p2vg lists affected ranges: Packagist silverstripe/mfa >=0 <6.0.0 (fixed))

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