CVE-2026-115333 in Lotus
Summary
by MITRE • 10/22/2026
Lotus through 0.10.2 contains an improper authentication vulnerability in the Go event ingestion middleware that validates API keys by prefix only, without checking the secret against the stored hashed_key. Attackers who know or obtain an API key prefix can submit usage events to POST /api/track/ as that organization, altering its metered usage and billing.
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Analysis
by VulDB Data Team • 10/22/2026
The vulnerability identified in Lotus versions through 0.10.2 represents a critical failure in authentication logic within the Go-based event ingestion middleware. This flaw specifically affects how API keys are validated during requests to the POST /api/track/ endpoint, which is responsible for ingesting usage events into the system. The core technical deficiency lies in the validation mechanism itself, where the application checks only the prefix of the provided API key against stored records rather than performing a complete verification that includes the secret portion hashed and compared against the stored hashed_key. This approach fundamentally undermines the security model by allowing any user who possesses or can guess an API key prefix to bypass authentication controls entirely for subsequent operations associated with that organization's account.
From a technical perspective, this issue aligns closely with CWE-287 Improper Authentication, as the system fails to adequately verify the identity of users attempting to access resources. The middleware’s reliance on partial string matching rather than cryptographic verification or full key validation creates a significant attack surface. In standard secure implementations, API keys are typically composed of an identifier and a secret component, both of which must be validated against securely stored credentials, often using constant-time comparison functions to prevent timing attacks. By neglecting the second half of this process, Lotus allows attackers to impersonate legitimate organizations simply by knowing their public-facing key prefix, which is frequently exposed in client-side code or logs.
The operational impact of this vulnerability is severe and directly affects data integrity and financial accuracy within the platform. Attackers can submit fraudulent usage events that are processed as if they originated from the targeted organization. This manipulation alters the metered usage metrics calculated by the system, leading to inaccurate billing records. For service providers relying on these metrics for revenue generation, this results in potential financial loss or disputes with customers whose accounts have been tampered with. Furthermore, the integrity of analytics and reporting features dependent on accurate event data is compromised, potentially affecting business decisions based on flawed telemetry.
This exploitation technique maps to MITRE ATT&CK tactic T1078 Valid Accounts, specifically under the sub-technique of using valid credentials that are insufficiently protected or partially exposed. The attacker leverages known information about a legitimate account structure to gain unauthorized access and perform actions typically restricted to authenticated users with full privileges. This scenario highlights the dangers of implementing custom authentication logic without adhering to established security standards, particularly when dealing with sensitive operations like billing and usage tracking.
To mitigate this vulnerability, immediate remediation is required by updating Lotus to a version later than 0.10.2 where the issue has been addressed. The fix involves modifying the event ingestion middleware to enforce strict validation of both the prefix and the secret portion of API keys before processing any requests. Implementing constant-time comparison for hash verification will prevent timing-based side-channel attacks that could otherwise aid in key recovery. Additionally, organizations should rotate all affected API keys immediately upon upgrading or patching their systems to invalidate any potentially compromised credentials. Long-term security improvements include adopting standardized authentication libraries and conducting regular code reviews focused on identity management and access control mechanisms to ensure compliance with industry best practices for secure software development.