CVE-2026-55186
Silverstripe MFA: Can bypass MFA during password reset flow
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- High
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
Silverstripe MFA: Can bypass MFA during password reset flow
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.
- Record
CVE-2026-55186- 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 - Weakness
- CWE-288
- Updated
- 2026-11-03
EUVDEUVD-2026-116372
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.
- Record
EUVD-2026-116372- 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 - Updated
- 2026-11-04
GitHub AdvisoriesGHSA-68wq-phq7-p2vg
MultiFactor Authentication for SilverStripe can bypass MFA during password reset flow
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.
- Record
GHSA-68wq-phq7-p2vg- 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 - Weakness
- CWE-288
- Updated
- 2026-11-03
NVD
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.
- Record
CVE-2026-55186- 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 - Weakness
- CWE-288
- Updated
- 2026-11-04
OSV
Silverstripe MFA: Can bypass MFA during password reset flow
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.
- Record
CVE-2026-55186- 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 - Weakness
- CWE-288
- Updated
- 2026-11-05
OSVGHSA-68wq-phq7-p2vg
MultiFactor Authentication for SilverStripe can bypass MFA during password reset flow
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.
- Record
GHSA-68wq-phq7-p2vg- 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 - Weakness
- CWE-288
- Updated
- 2026-11-03
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
silverstripe/mfaPackagist |
before 6.0.0 | 6.0.0 |
silverstripe/mfaPackagist |
before 6.0.0, plus listed versions 3.0.03.0.0-rc13.0.14.0.04.0.0-beta1 Show 45 moreShow less4.0.0-beta24.0.0-beta34.0.0-beta44.0.0-rc14.0.0-rc24.0.14.0.24.0.34.0.44.0.54.0.64.1.04.1.14.2.04.2.14.2.24.3.04.3.0-beta14.3.0-rc14.4.04.4.0-alpha14.4.0-beta14.4.0-rc14.5.04.5.14.6.14.6.24.6.34.7.04.7.0-beta14.7.0-rc14.8.04.8.0-beta14.8.0-rc14.8.14.8.24.8.35.0.05.0.0-beta15.0.0-beta25.0.0-rc15.0.15.1.05.1.0-beta15.1.0-rc1 |
6.0.0 |
History
| Recorded | Changed | Sources |
|---|---|---|
| references | CVE List, EUVD, NVD, OSV | |
| aliases, description, products, references, severity, title | CVE List, EUVD | |
| references | OSV | |
| facts, references | GitHub Advisories | |
| first indexed | GitHub Advisories, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-55186 is a medium vulnerability (CVSS 4.2) in Silverstripe Silverstripe-mfa, published October 29, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.28%, the 20th percentile. Fixed in silverstripe/mfa 6.0.0.
References
github.com/silverstripe/silverstripe-mfa/security/advisories/GHSA-68wq-phq7-p2vg
Show 6 moreShow less
silverstripe.org/download/security-releases/cve-2026-55186
nvd.nist.gov/vuln/detail/CVE-2026-55186
Left out here: 22 versions. The JSON record has them.