# CVE-2026-30777: Auth bypass in EC-CUBE 4.1 series

> Attackers with valid admin credentials can bypass two-factor authentication to gain unauthorized access to the administrative interface.

- **Severity:** Medium 6.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 5 Mar 2026
- **Updated:** 6 Mar 2026
- **Also known as:** GHSA-x865-r8g8-5r6r

## What is CVE-2026-30777?

CVE-2026-30777 is a medium-severity authentication bypass vulnerability in EC-CUBE 4.1 series, published on 5 Mar 2026. An attacker needs administrator access to exploit it, with no action from the victim.

### Official 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.

Weakness: CWE-288 (Authentication Bypass Using an Alternate Path or Channel)

## Which versions are affected by CVE-2026-30777?

It affects 1 product.


Products: Ec-Cube Ec-Cube.

## How do I fix CVE-2026-30777?

No fix has been published for CVE-2026-30777 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-30777 being exploited?

There is no known exploitation of CVE-2026-30777 in the wild and no public exploit code.

## Other vulnerabilities in EC-CUBE 4.1 series

- [CVE-2020-5590](https://insights.sbomify.com/CVE-2020-5590/): EC-CUBE Directory traversal vulnerability (high 8.1)
- [CVE-2021-20778](https://insights.sbomify.com/CVE-2021-20778/): Missing authorization in EC-CUBE (high 7.5)
- [CVE-2020-5680](https://insights.sbomify.com/CVE-2020-5680/): EC-CUBE Improper input validation vulnerability (high 7.5)
- [CVE-2008-4991](https://insights.sbomify.com/CVE-2008-4991/): SQL injection in n/a (high 7.5)
- [CVE-2008-4534](https://insights.sbomify.com/CVE-2008-4534/): SQL injection in n/a (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-30777 and fix it if it is affected.

What it is: CVE-2026-30777 is a medium-severity authentication bypass vulnerability in EC-CUBE 4.1 series, published on 5 Mar 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-30777 in the wild and no public exploit code.

Affected product: EC-CUBE 4.1 series. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-30777/ (Markdown: https://insights.sbomify.com/CVE-2026-30777/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-30777
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-30777
- OSV: https://osv.dev/vulnerability/CVE-2026-30777

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-30777/
Summaries are generated and may contain mistakes; the official description above is the record.