CVE-2026-78555 in RansomLook
Summary
by MITRE • 08/24/2026
RansomLook exposed complete API keys in the HTML source of the authenticated /admin/apikeys administration page. Although the interface displayed only a shortened representation of each key, the full token was embedded in hidden form fields used by the enable/disable, private-access, and delete actions.
As a result, API credentials could be recovered by inspecting the page source or DOM. The credentials could also be unintentionally exposed through components that retain or inspect HTTP response bodies, such as debugging proxies, browser caches, monitoring systems, or other intermediaries. An attacker obtaining one of these tokens could subsequently authenticate using the privileges assigned to that key, including access to private data where the key was granted such permissions.
The patch removes API keys from subsequent page rendering and replaces them with SHA-256-derived opaque handles. Administrative actions submit only these handles, which are resolved back to the corresponding token on the server. The full API key is therefore disclosed only once, when it is initially created.
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Analysis
by VulDB Data Team • 08/24/2026
The vulnerability identified in RansomLook represents a critical failure in secure credential management and front-end security practices, specifically categorized under CWE-798: Use of Hard-coded Credentials or CWE-200: Exposure of Sensitive Information to an Unauthorized Actor. The core technical flaw lies in the architectural decision to embed full API keys within hidden HTML form fields on the authenticated administration page for managing API credentials. While the user interface intentionally obscured these values by displaying only shortened representations, this visual masking provided a false sense of security that did not align with the underlying data transmission and storage mechanisms. By including the complete token in the Document Object Model (DOM), the application inadvertently created an attack vector accessible to any entity capable of viewing page source code or intercepting client-side script execution. This design violates fundamental principles of least privilege and defense-in-depth, as it assumes that hidden fields are secure against inspection, which is a well-known misconception in web security.
From an operational perspective, the impact of this vulnerability extends beyond simple credential theft to potential data breaches and unauthorized system access. An attacker who gains access to the administration interface, either through compromised credentials or other vulnerabilities such as Cross-Site Scripting (XSS), can easily extract these full API keys by inspecting the page source or utilizing browser developer tools. Furthermore, the exposure is not limited to direct user interaction; the tokens are susceptible to leakage via intermediate systems that log HTTP response bodies. Debugging proxies like Burp Suite, browser caches on shared workstations, and network monitoring appliances may store copies of these responses, creating persistent artifacts containing sensitive credentials long after they were initially viewed. This amplifies the blast radius significantly, as recovery does not require active exploitation at the moment of viewing but can occur during forensic analysis or log review by malicious insiders or external attackers who have gained access to logging infrastructure.
The ability to recover these tokens allows an attacker to authenticate using the privileges assigned to the compromised key. If a specific API key was granted permissions to access private data, delete records, or modify system configurations, the attacker inherits those capabilities without needing further authentication steps. This effectively bypasses multi-factor authentication and session management controls that might otherwise protect administrative functions, as the API key itself serves as a persistent bearer token. The attack path aligns with MITRE ATT&CK techniques such as T1504: Web Service Remote Services or T1078: Valid Accounts, depending on how initial access was achieved, and highlights the risks associated with storing high-entropy secrets in client-side state where they are vulnerable to extraction via DOM-based mechanisms.
The remediation strategy employed by RansomLook addresses these issues through a fundamental shift in how credentials are handled during rendering and submission. The patch removes the full API keys from subsequent page renders, replacing them with SHA-256-derived opaque handles. These hashes serve as non-reversible references that allow the server to resolve actions back to the corresponding token without ever transmitting or displaying the secret itself. Administrative actions now submit only these safe identifiers, ensuring that even if an attacker inspects network traffic or DOM elements after the initial creation of a key, they will not encounter sensitive material. This approach adheres to industry best practices for secure credential handling by minimizing the exposure window and eliminating client-side storage of secrets where possible. It also reduces the risk of accidental leakage through logging systems since only non-sensitive hashes are transmitted in HTTP requests post-creation.
To further mitigate risks associated with API key management, organizations should implement additional controls such as rotating keys regularly to limit the utility of any single compromised token and enforcing strict access controls on administrative interfaces using multi-factor authentication. Monitoring for unusual patterns in API usage can also help detect exploitation attempts early. The transition from exposing full secrets in client-side code to using server-resolved opaque identifiers represents a significant improvement in security posture, aligning with secure coding standards that prioritize keeping sensitive data out of the browser environment whenever feasible. This case serves as a reminder that visual obfuscation is not equivalent to security and that all components of an application, including hidden form fields, must be treated as potentially visible to adversaries.