CVE-2026-112296 in FlyCms
Summary
by MITRE • 10/19/2026
FlyCms through commit edfdf724 contains a default credentials vulnerability that allows unauthenticated remote attackers to gain super administrator access via the flycms account with password admin123. Attackers can log in through POST /api/auth/login, solving only the image captcha, to obtain full control of site content, users and configuration.
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Analysis
by VulDB Data Team • 10/19/2026
The FlyCms platform suffers from a critical default credentials vulnerability that fundamentally undermines its authentication security model. This flaw stems from the use of hardcoded or persistently configured weak administrative credentials within the application's codebase or database initialization scripts. Specifically, an account designated with the username flycms and the password admin123 remains active by default in certain configurations prior to commit edfdf724. This represents a severe deviation from security best practices which mandate that all software must ship without known default passwords or require immediate credential rotation upon first use. The presence of such predictable credentials allows unauthenticated remote attackers to bypass authentication mechanisms entirely, gaining super administrator access with minimal effort and no need for complex exploitation techniques beyond basic web interaction.
The operational impact of this vulnerability is profound as it grants the attacker full control over the content management system. By leveraging standard HTTP POST requests directed at the /api/auth/login endpoint, an adversary can authenticate using the compromised credentials. The authentication process requires solving only a simple image captcha, which serves primarily to prevent automated bot flooding rather than providing robust security against targeted attacks. Once authenticated, the attacker assumes the role of super administrator, enabling them to modify site content, manage user accounts, alter system configurations, and potentially execute arbitrary code if the CMS allows plugin or theme injection through its administrative interface. This level of access effectively compromises the confidentiality, integrity, and availability of the entire web application hosted on FlyCms.
From a technical classification perspective, this vulnerability aligns with CWE-798: Use of Hard-coded Credentials, as it involves the use of static credentials that are known to attackers or easily guessable due to their simplicity. It also relates to CWE-287: Improper Authentication, since the system fails to enforce strong identity verification for privileged accounts. In terms of attack vectors and tactics, this scenario maps directly to MITRE ATT&CK technique T1078: Valid Accounts, where adversaries leverage legitimate credentials obtained through various means, including default configurations, to maintain persistent access. The requirement to solve a captcha indicates that while the system has some anti-automation measures, it lacks sufficient complexity or entropy in its credential policy to deter manual attacks by determined threat actors.
Mitigation strategies must address both immediate remediation and long-term security posture improvements. Administrators should immediately update FlyCms to versions post-commit edfdf724 where this default account is either removed or requires mandatory password change upon first login. For systems that cannot be updated instantly, the flycms administrative account must be disabled or its credentials changed to a strong, unique passphrase generated using cryptographic randomness. Additionally, implementing multi-factor authentication for all administrator accounts adds a critical layer of defense against credential-based attacks. Security teams should also conduct regular audits of default configurations and ensure that deployment scripts do not retain test data or weak passwords in production environments. Monitoring login attempts for the flycms account can help detect ongoing exploitation activities early.