CVE-2026-85298 in Application Integration
Summary
by MITRE • 10/15/2026
An Incorrect Authorization vulnerability in the AuthConfig validation and integration execution runtime in Google Cloud Application Integration versions prior to 2026-08-27 allows an authenticated user to escalate privileges and impersonate a service account in the project.
This vulnerability was patched on 27 August 2026, and no customer action is needed.
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Analysis
by VulDB Data Team • 10/15/2026
The identified flaw resides within the AuthConfig validation logic of Google Cloud Application Integration, specifically affecting versions released prior to the patch date of August 27, 2026. This component serves as a critical gatekeeper for authentication configurations that dictate how services interact with one another and access underlying cloud resources. The vulnerability stems from an incorrect authorization check during the integration execution runtime phase. When a user initiates or modifies an integration workflow, the system is supposed to validate whether the requesting entity possesses sufficient privileges to perform the action on behalf of specific service accounts. However, due to this logic error, the validation mechanism fails to strictly enforce identity boundaries between the authenticated human user and the target service account context.
From a technical perspective, this represents a classic case of broken access control where the system trusts input or session state without adequately verifying the scope of permissions granted by the Identity and Access Management framework. An attacker who has obtained valid credentials for an authenticated user within the Google Cloud project can exploit this flaw to bypass standard permission checks. By manipulating the request parameters associated with AuthConfig validation, the malicious actor can trick the runtime into executing actions under the identity of a service account that typically holds higher privileges than the original user. This effectively allows privilege escalation, as the attacker gains the ability to impersonate entities that are designed for machine-to-machine communication and often possess broader access rights to sensitive data or infrastructure components.
The operational impact of this vulnerability is significant because it undermines the principle of least privilege within Google Cloud projects. Service accounts are frequently configured with specific roles tailored to their functional needs, but in many cases, they may have permissions that individual user accounts do not hold, such as accessing private storage buckets, managing compute instances, or invoking other cloud APIs. By impersonating these service accounts, an attacker can perform actions that would otherwise be denied to the compromised user account. This could lead to unauthorized data exfiltration, modification of critical infrastructure configurations, or further lateral movement within the environment by leveraging the elevated permissions of the impersonated service account. The lack of proper separation between human and machine identities in this specific runtime context creates a pathway for abuse that bypasses traditional identity-based security controls.
This vulnerability aligns with CWE-269, which describes Improper Privilege Assignment, as it allows an actor to assume privileges they are not explicitly granted by the administrator or policy framework. Furthermore, from the perspective of the MITRE ATT&CK framework, this behavior maps directly to T1078 Valid Accounts and specifically T1550 Use Alternate Authentication Credentials, where attackers leverage legitimate credentials to gain unauthorized access. The exploitation technique also reflects aspects of T1496 Resource Hijacking if the impersonated service account is used for computational resources or data theft. Understanding these mappings helps security teams contextualize the risk within broader threat intelligence models and prioritize remediation efforts based on established attack patterns observed in real-world incidents involving cloud identity abuse.
Google addressed this issue by correcting the authorization logic in the AuthConfig validation process, ensuring that privilege escalation via service account impersonation is no longer possible through this specific vector. The patch was released on August 27, 2026, and updates were distributed to affected versions of Google Cloud Application Integration. For organizations utilizing this platform, it is imperative to verify that all instances are running the patched version or later. Since the vulnerability relies on authenticated access within a project, maintaining strong identity hygiene remains crucial. This includes enforcing multi-factor authentication for user accounts, regularly auditing service account permissions to ensure they adhere to least privilege principles, and monitoring logs for unusual patterns of impersonation attempts. Although no immediate customer action is required beyond updating software versions, proactive security measures such as enabling Cloud Audit Logs with a focus on Identity and Access Management events can help detect any potential exploitation attempts that may have occurred prior to the patch deployment.