What is CVE-2026-30777?

CVE-2026-30777 is a medium-severity vulnerability in Ec-Cube, classified under Authentication Bypass Using an Alternate Path or Channel. CVSS score: 6.5/10. Published 2026-03-05.

How severe is CVE-2026-30777?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Ec-Cube

CVE-2026-30777

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.

EPSS: 0.003 (26.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N.

Affected products

Ec-cube — versions 4.1.2, 4.2.3, 4.3.1
Ec-cube Co.,ltd. 4.1 Series — versions prior to 4.1.2-p5
Ec-cube Co.,ltd. 4.2 Series — versions prior to 4.2.3-p2
Ec-cube Co.,ltd. 4.3 Series — versions prior to 4.3.1-p1

Weakness classification (CWE)

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

References

vultures@jpcert.or.jp (Patch, Vendor Advisory)
vultures@jpcert.or.jp (Third Party Advisory)

Frequently asked questions

What is CVE-2026-30777?: CVE-2026-30777 is a medium-severity vulnerability in Ec-Cube, classified under Authentication Bypass Using an Alternate Path or Channel. CVSS score: 6.5/10. Published 2026-03-05.
How severe is CVE-2026-30777?: Medium severity. CVSS v3 base score is 6.5 out of 10.