VulnerabilityPublished 5 Mar 2026Updated 6 Mar 2026

CVE-2026-30777: EC-CUBE 4.1 series · Authentication Bypass Using an Alternate Path or Channel

Affects EC-CUBE 4.1 seriesSource CVE Database V5

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Not known to be exploited · CVSS 4.9 Medium · fixed in 4.1.2 : update EC-CUBE 4.1 series when convenient.

Data as of 30 Oct 2026, 11:52 UTC

CVSS 3.0 base score

4.9Medium

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.3% chance of exploitation in 30 days – higher than 28% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 4.1.2

CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N

Attack Vector: Network
Attack Complexity: Low
Privileges Required: High
User Interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: High
Availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: High: The attacker is authorized with (i.e., requires) privileges that provide significant (e.g., administrative) control over the vulnerable component that could affect component-wide settings and files.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: None: There is no loss of confidentiality within the impacted component.
Integrity: High: There is a total loss of integrity, or a complete loss of protection. For example, the attacker is able to modify any/all files protected by the impacted component. Alternatively, only some files can be modified, but malicious modification would present a direct, serious consequence to the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 5 Mar 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Affected software

Product	Affected	Fixed in
EC-CUBE CO.,LTD.EC-CUBE 4.1 series	Affected =prior to 4.1.2-p5	Fixed in–
EC-CUBE CO.,LTD.EC-CUBE 4.2 series	Affected =prior to 4.2.3-p2	Fixed in–
EC-CUBE CO.,LTD.EC-CUBE 4.3 series	Affected =prior to 4.3.1-p1	Fixed in–

AI-suggested

Immediately upgrade all EC-CUBE 4.1 series installations to version 4.1.2-p5 or later, which contains the patch for this vulnerability.
Enforce strong credential management policies, including regular password changes, use of password managers, and monitoring for credential leaks or phishing attempts.
Implement additional layers of security beyond MFA, such as IP whitelisting for administrative access, VPN requirements, or hardware security modules.
Conduct regular audits of administrative access logs to detect unusual login patterns or access from unexpected locations.
Use web application firewalls (WAF) to monitor and block suspicious requests targeting authentication endpoints.
Educate administrators on phishing risks and the importance of safeguarding credentials.
Consider deploying anomaly detection systems that can flag abnormal administrative behavior for further investigation.
Review and harden all alternate authentication paths or API endpoints to ensure MFA enforcement is consistent and cannot be bypassed.
Maintain an incident response plan specifically addressing potential administrative account compromises.
Coordinate with EC-CUBE vendor support for any additional security advisories or recommended configurations.

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.

Impact

The primary impact of CVE-2026-30777 is the compromise of administrative integrity within EC-CUBE 4.1 series installations. An attacker who has valid administrator credentials can bypass MFA and gain full administrative access, enabling them to modify site configurations, manipulate product listings, access sensitive business data, or deploy malicious code. This can lead to significant business disruption, financial loss, reputational damage, and potential data integrity issues. While confidentiality and availability are not directly impacted by this vulnerability, the ability to alter administrative settings or inject malicious content can indirectly affect these aspects. The ease of exploitation is moderate since valid admin credentials are required, but credential theft or phishing attacks are common, making this a realistic threat. Organizations worldwide using EC-CUBE 4.1 series are at risk, especially those with weak credential management or insufficient monitoring. The lack of known exploits in the wild currently reduces immediate risk but does not eliminate the threat, as attackers may develop exploits once the vulnerability is public. Overall, this vulnerability can facilitate unauthorized administrative control, undermining trust in the e-commerce platform and potentially enabling further attacks such as data manipulation or supply chain compromise.

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 12 Mar 2026, 20:24 UTC

Technical details

References

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