CVE-2026-30799: RTI Connext Professional Identity Spoofing via Missing Authentication

Technical summary

CVE-2026-30799 is a missing authentication vulnerability (CWE-306) in the Security Plugins component of RTI Connext Professional. The flaw permits identity spoofing because critical authentication checks are absent from protected functions. An attacker with valid credentials can assume another user's identity and perform actions with that identity's privileges. The vulnerability carries a CVSS 3.1 score of 8.1 (HIGH), reflecting high impact to integrity and availability combined with low attack complexity and network accessibility.

Business impact

Identity spoofing within a real-time data distribution system poses significant operational risk. An insider or compromised account holder could alter message routing, inject false data into safety-critical systems, or disable monitoring without attribution. For organizations using Connext in industrial control, financial trading, or healthcare applications, this could result in undetected data corruption, compliance violations, or system downtime. The authenticated-attacker requirement limits the initial attack surface, but compromised credentials are common in breach scenarios.

Affected systems

RTI Connext Professional versions affected: 5.3.0 through 5.3.x (latest 5.3), 6.0.0 through 6.0.x (latest 6.0), 6.1.0 through 6.1.x (latest 6.1), 7.0.0 through 7.3.x (latest 7.3), and 7.4.0 through 7.6.x (latest before 7.7.0). Organizations running any of these versions should treat this as a priority inventory item. The Security Plugins component is explicitly affected; verify whether your deployment includes this module.

Exploitability

Exploitation requires valid Connext credentials (PR:L in the CVSS vector), meaning it is not remotely exploitable by unauthenticated parties. However, the absence of hard authentication requirements on critical functions means that once a user is authenticated to the system, they can spoof other identities without additional checks. The low attack complexity suggests no special conditions or tools are needed beyond normal system access. This makes it attractive in insider-threat scenarios or post-compromise lateral movement.

Remediation

Upgrade to patched versions. RTI has released fixes in later version branches; verify the specific patch versions applicable to your deployment against the RTI advisory. Organizations unable to patch immediately should review and strengthen authentication policies around Connext user accounts, audit identity-based actions, and consider network segmentation to limit lateral movement from a compromised account.

Patch guidance

Contact RTI or consult their security advisory for exact patched version numbers corresponding to your current major version branch. Generally, upgrading to version 7.7.0 or later resolves the issue for 7.x deployments. For 6.x and 5.x users, verify the latest available patch in those branches. Patch deployment should be tested in a non-production environment first to ensure compatibility with dependent systems and plugins.

Detection guidance

Monitor for unusual identity-assumption activity within Connext: look for successful authentications followed by role or identity changes without corresponding user action or privileged session logs. Enable detailed audit logging on security plugin operations and cross-reference user activities with network session data. Behavioral analytics that flag accounts performing actions inconsistent with their normal patterns may catch spoofing attempts. Review Connext security logs for authentication anomalies or repeated identity changes.

Why prioritize this

This vulnerability merits urgent attention despite the authenticated-attacker requirement because: (1) real-time systems often handle critical or safety data where integrity is paramount; (2) identity spoofing is difficult to detect and leaves no clear audit trail; (3) multiple major version branches are affected, increasing the likelihood of exposure in organizations with heterogeneous deployments; (4) remediation requires planned patching rather than configuration changes. Prioritize based on whether Connext is deployed in safety-critical or compliance-sensitive contexts.

Risk score, explained

The CVSS 8.1 HIGH rating reflects the combination of high integrity and availability impact (I:H/A:H) with network-accessible attack vector (AV:N) and low complexity (AC:L). The score is moderated by the requirement for prior authentication (PR:L), which prevents wormable exploitation. Organizations should interpret this as a serious vulnerability that becomes critical in the context of insider threats or following credential compromise elsewhere in the infrastructure.

Frequently asked questions