What is CVE-2026-55186?

CVE-2026-55186 is a medium-severity vulnerability in Silverstripe Silverstripe-Mfa, classified under Authentication Bypass Using an Alternate Path or Channel. CVSS score: 4.2/10. Published 2026-11-03.

How severe is CVE-2026-55186?

Medium severity. CVSS v3 base score is 4.2 out of 10.

Vulnerability in Silverstripe Silverstripe-Mfa

CVE-2026-55186

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.

Published 2026-11-03 · last modified 2026-11-03.

CVSS v3 metric

CVSS v3 base score 4.2 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Silverstripe Silverstripe-Mfa — versions < 6.0.0

Weakness classification (CWE)

CWE-288 — Authentication Bypass Using an Alternate Path or Channel

References

Frequently asked questions

What is CVE-2026-55186?: CVE-2026-55186 is a medium-severity vulnerability in Silverstripe Silverstripe-Mfa, classified under Authentication Bypass Using an Alternate Path or Channel. CVSS score: 4.2/10. Published 2026-11-03.
How severe is CVE-2026-55186?: Medium severity. CVSS v3 base score is 4.2 out of 10.