Description

Unauthenticated Privilege Escalation in Capella <= 2.5.5 versions.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "9.8",
  "pubDate": "2026-08-20T12:16:31.890Z",
  "pubdate": "2026-08-20T12:16:31.890Z",
  "executiveSummary": "An unauthenticated privilege escalation vulnerability has been identified in Capella versions 2.5.5 and below. This security flaw allows remote, unauthenticated attackers to elevate their privilege levels within the affected system without requiring prior access credentials or valid sessions.\nThe vulnerability poses a severe risk to organizational security, as successful exploitation enables malicious actors to bypass authentication mechanisms entirely and assume administrative or high-privilege roles.\nThe primary impact includes complete loss of confidentiality, integrity, and availability of the underlying application and associated data. The attack vector is network-based, requiring direct reachability to the vulnerable Capella instance.\nGiven the lack of required authentication or user interaction, external threat actors can automate exploitation to compromise targeted deployments rapidly. Organizations utilizing vulnerable iterations of the product face immediate exposure to unauthorized administrative actions, data exfiltration, and potential system-wide administrative takeover.",
  "technicalDetails": "The vulnerability resides in the core authentication and authorization logic of Capella versions <= 2.5.5, specifically within the request handling and session initialization components.\nThe root cause stems from improper validation of incoming authorization parameters and insufficient access control enforcement during unauthenticated request processing. The application fails to properly distinguish between authenticated session contexts and unauthenticated states when processing specific control-flow pathways.\nAttackers can exploit this flaw by sending crafted, unauthenticated HTTP requests containing manipulated parameters or headers directly to the vulnerable component. Because the application logic improperly trusts these client-supplied values without rigorous cryptographic verification or internal state validation, it incorrectly elevates the execution context of the request.\nThe attack flow proceeds as follows: First, the adversary establishes network connectivity with the target Capella instance exposed via standard network protocols. Second, the attacker crafts a malicious request payload designed to trigger the flawed authorization handler within the application logic. Third, upon receiving the payload, the vulnerable component processes the input and erroneously assigns administrative privileges or elevated security contexts to the unauthenticated session.\nPost-exploitation impact allows the attacker to execute privileged administrative functions, modify system configurations, access restricted data repositories, and potentially deploy secondary payloads or backdoors within the environment. The vulnerability requires zero privileges, no pre-existing user accounts, and operates entirely over the network layer."
}