CVE-2026-111653 in 53AIHub
Summary
by MITRE • 10/16/2026
53AIHub through 0.5.3 contains a missing authentication vulnerability that allows unauthenticated attackers to overwrite any enterprise's profile by sending PUT requests to /api/enterprises/:id. Because UpdateEnterprise only enforces checks when IS_SAAS is true, attackers can enumerate sequential enterprise IDs and overwrite logos, display names and branding for defacement and phishing.
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Analysis
by VulDB Data Team • 10/16/2026
The vulnerability identified in 53AIHub versions through 0.5.3 represents a critical failure in access control mechanisms, specifically classified under CWE-287 as Improper Authentication. This flaw stems from an inconsistent implementation of security checks within the UpdateEnterprise function, which governs modifications to enterprise profiles via PUT requests directed at the /api/enterprises/:id endpoint. The root cause lies in the conditional logic that restricts authentication enforcement solely when the IS_SAAS flag is set to true. In environments where this flag is false or not properly configured, the application fails to verify the identity of the user initiating the request, thereby allowing unauthenticated actors to interact with sensitive administrative endpoints without providing valid credentials.
From a technical perspective, the absence of authentication checks creates an opportunity for attackers to perform unauthorized state changes on enterprise data structures. By sending HTTP PUT requests to sequentially enumerated enterprise IDs, malicious actors can overwrite critical profile attributes such as logos, display names, and branding elements. This capability transforms what might otherwise be a simple information disclosure issue into a severe integrity violation, enabling the modification of public-facing assets that define an organization's digital identity. The sequential nature of many database identifiers further exacerbates this risk by allowing attackers to systematically iterate through potential IDs until they locate active enterprise accounts susceptible to manipulation.
The operational impact of this vulnerability extends beyond mere defacement and serves as a significant vector for social engineering attacks, aligning with ATT&CK technique T1566.002 (Spearphishing Link) or more broadly T1498 (Network Denial of Service via Defacement). By altering the visual identity of an enterprise, attackers can create convincing phishing pages that mimic legitimate services to harvest credentials or distribute malware. The trust associated with a recognized brand logo and name is exploited to lower victim vigilance, leading to potential data breaches, financial fraud, or compromise of downstream systems connected to the targeted enterprise accounts. This undermines the integrity of the platform and erodes user confidence in the security posture of 53AIHub deployments.
Mitigation strategies must address both the immediate code flaw and broader architectural assumptions regarding trust boundaries. The primary remediation involves ensuring that authentication checks are enforced universally for all administrative endpoints, regardless of the IS_SAAS configuration state. Developers should implement role-based access control (RBAC) to verify not only that a user is authenticated but also that they possess the specific privileges required to modify enterprise profiles. Additionally, implementing rate limiting and anomaly detection on the /api/enterprises/:id endpoint can help mitigate enumeration attacks by detecting rapid sequential requests from single sources. Organizations should also consider using non-sequential identifiers for enterprises to increase the complexity of ID guessing, although this is a secondary defense compared to enforcing strict authentication protocols across all sensitive API operations.