CVE-2026-108336 in Remot Ops Agent
Summary
by MITRE • 10/15/2026
When the default self-signed certificate is used, an attacker could gain administrative access to the application.
The SSL certificate for the web interface is used to sign JWT access tokens that are used to validate that the user is logged in. When the default SSL certificate is used, an attacker could have the capability to sign JWT access tokens and bypass login.
An attacker could gain administrative access to the application and perform actions like configuring the service or requesting log collection. Device credentials and customer data cannot be accessed with this vulnerability.
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Analysis
by VulDB Data Team • 10/15/2026
The vulnerability described constitutes a critical authentication bypass mechanism rooted in the improper handling of cryptographic keys associated with JSON Web Tokens (JWT). In secure web application architectures, JWTs are commonly used to maintain stateless session information after initial authentication. These tokens typically contain claims about the user and are digitally signed using a secret key or private certificate to ensure integrity and authenticity. The specific flaw arises when the system relies on the default self-signed SSL/TLS certificate for signing these access tokens rather than generating or provisioning a dedicated, secure signing key. This configuration error creates a scenario where the public components of the certificate become predictable or publicly accessible in a manner that compromises the secrecy required for token validation.
From a technical perspective, JWT signatures are designed to prevent tampering by ensuring that any modification to the token's payload invalidates the signature unless the attacker possesses the signing key. However, when default self-signed certificates are utilized, particularly in development or initial deployment phases, these certificates often follow standardized patterns or contain public keys that can be extracted from the server itself. If an attacker can obtain the private key associated with this certificate—or if the implementation incorrectly allows verification using only the public key for certain operations—the cryptographic guarantee of integrity is nullified. This allows the adversary to craft arbitrary JWTs, embedding administrative claims such as role-based access control flags indicating superuser status, and sign them effectively without needing valid user credentials.
The operational impact of this vulnerability is severe, granting an attacker full administrative privileges over the application interface. With unauthorized admin access, the threat actor can reconfigure critical service settings, potentially altering network parameters or security policies to further entrench their presence. Furthermore, they may initiate log collection processes that could be manipulated to hide malicious activities or exfiltrate system logs containing sensitive operational data. While the vulnerability description notes that direct extraction of device credentials and customer PII is not a direct consequence of this specific flaw, the ability to manipulate service configurations poses an indirect risk to overall system integrity and availability. An attacker might disable logging mechanisms, alter firewall rules, or disrupt services, leading to significant downtime or operational disruption for the organization relying on the application.
This issue aligns with CWE-295 Improper Certificate Validation and CWE-347 Improper Verification of Cryptographic Signature, as it involves both the misuse of certificate management practices and a failure in verifying the authenticity of signed tokens. In terms of the MITRE ATT&CK framework, this vulnerability facilitates the T1078 Valid Accounts technique by allowing an attacker to assume legitimate administrative identities without prior compromise of user credentials. It also relates to TA0005 Defense Evasion if used to manipulate logging configurations. To mitigate this risk, organizations must enforce strict certificate management policies that prohibit the use of default or self-signed certificates in production environments for signing sensitive tokens like JWTs. Implementing a dedicated Key Management Service (KMS) and rotating signing keys regularly ensures that even if one key is compromised, the window of exposure remains limited. Additionally, applications should validate token signatures using robust cryptographic libraries that strictly enforce private key secrecy and prevent verification with public keys where inappropriate.