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

Routine

MEDIUM 6.5UPGRADE

CVE-2026-30777 is a medium-severity flaw (CVSS 6.5) affecting ec-cube. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	0.4% (top 71%)
CISA exploited list	No
Weakness	CWE-288
Published	2026-03-05
Last modified	2026-06-17

Publisher (CNA): JPCERT/CC · Vendor: ec-cube

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-05 06:16 UTCPublished CVE record published
2026-06-17 10:32 UTCUpdated Record last modified

ec-cube ec-cube UPGRADE

Affected: >= 4.1.0 and < 4.1.2 · >= 4.2.0 and < 4.2.3 · >= 4.3.0 and < 4.3.1 · 4.1.2 · 4.1.2 p1 · 4.1.2 p2 · 4.1.2 p3 · 4.1.2 p4

Fixed in: 4.1.2, 4.2.3, 4.3.1

Safe to downgrade to: a release before 4.1.0

1. Check installed version

apt-cache policy ec-cube || rpm -q ec-cube || ec-cube --version

2. UPGRADE to 4.1.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade ec-cube

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade ec-cube

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 4.1.0 (Debian / Ubuntu)

apt-cache madison ec-cube sudo apt install ec-cube=<VERSION_BEFORE_4.1.0> sudo apt-mark hold ec-cube

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list ec-cube sudo dnf downgrade ec-cube-<VERSION_BEFORE_4.1.0> sudo dnf versionlock add ec-cube

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-30777?

ec-cube: upgrade to 4.1.2, 4.2.3, 4.3.1. Exact commands for each OS are on this page.

Is CVE-2026-30777 being exploited?

CVE-2026-30777 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-30777 affect?

CVE-2026-30777 affects ec-cube. Severity is medium (CVSS 6.5). 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

How urgent is CVE-2026-30777?

Priority 30/100. No elevated risk signals yet.

References

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