CVE-2026-2697: Tenable Security Center IDOR Vulnerability

CVE-2026-2697 Overview

CVE-2026-2697 is an Insecure Direct Object Reference (IDOR) vulnerability affecting Tenable Security Center that allows authenticated remote attackers to escalate privileges through manipulation of the owner parameter. This access control flaw enables attackers with valid credentials to bypass authorization mechanisms and perform actions beyond their intended privilege level.

Critical Impact

Authenticated attackers can exploit this IDOR vulnerability to escalate privileges within Tenable Security Center, potentially gaining unauthorized access to sensitive security data, scan configurations, and administrative functions.

Affected Products

• Tenable Security Center

Discovery Timeline

• 2026-02-23 - CVE-2026-2697 published to NVD
• 2026-02-26 - Last updated in NVD database

Technical Details for CVE-2026-2697

Vulnerability Analysis

This vulnerability is classified as CWE-639 (Authorization Bypass Through User-Controlled Key), commonly known as Insecure Direct Object Reference (IDOR). The flaw exists in the authorization logic of Tenable Security Center, where the application fails to properly validate that the authenticated user is authorized to access or modify resources associated with the owner parameter.

When processing requests that include the owner parameter, the application does not adequately verify that the requesting user has the appropriate permissions to act on behalf of or access resources belonging to the specified owner. This allows an authenticated attacker to manipulate the owner parameter value in API requests or form submissions to reference other users' resources or assume elevated privileges.

The network-accessible nature of this vulnerability means that any authenticated user with network access to the Security Center interface can potentially exploit this flaw. The attack requires low complexity and does not need user interaction beyond the attacker's own actions.

Root Cause

The root cause of this vulnerability lies in insufficient authorization checks within Tenable Security Center's request handling logic. The application accepts a user-controllable owner parameter but fails to validate that the authenticated session has the authority to perform operations associated with that owner identity. This represents a fundamental access control design flaw where object references are directly exposed and trusted without proper server-side validation.

Attack Vector

The attack vector for CVE-2026-2697 involves an authenticated attacker crafting malicious requests to the Tenable Security Center application. The attacker modifies the owner parameter in HTTP requests to reference user identities with higher privileges or to access resources belonging to other users. This can be accomplished through direct manipulation of API calls or by intercepting and modifying web application requests.

The exploitation process involves identifying endpoints that accept the owner parameter, then systematically testing different owner values to discover which resources or privileges can be accessed. Successful exploitation allows the attacker to perform horizontal privilege escalation (accessing other users' resources) or vertical privilege escalation (gaining administrative capabilities).

Detection Methods for CVE-2026-2697

Indicators of Compromise

• Unusual API request patterns showing manipulation of the owner parameter with values that do not match the authenticated user's identity
• Log entries indicating access to resources or configurations belonging to users other than the authenticated session
• Multiple requests from a single user session attempting to enumerate different owner identifiers
• Unexpected modifications to scan configurations, policies, or settings by non-administrative users

Detection Strategies

• Implement application-level logging that captures all requests containing the owner parameter along with the authenticated user's identity for correlation analysis
• Deploy web application firewalls (WAF) with rules to detect parameter tampering patterns typical of IDOR attacks
• Monitor for anomalous access patterns where users are accessing resources outside their normal scope of permissions
• Correlate authentication logs with resource access logs to identify authorization bypass attempts

Monitoring Recommendations

• Enable detailed audit logging within Tenable Security Center to capture all privilege-related operations and resource access
• Configure SIEM rules to alert on mismatches between authenticated user identities and resource ownership in request logs
• Establish baseline user behavior profiles to detect deviations that may indicate exploitation attempts
• Regularly review access logs for patterns suggesting systematic enumeration of owner parameter values

How to Mitigate CVE-2026-2697

Immediate Actions Required

• Apply the security patch referenced in Tenable Security Advisory TNS-2026-07 immediately
• Review audit logs for any evidence of exploitation attempts or unauthorized privilege escalation
• Verify that all user accounts have appropriate minimum privilege assignments
• Implement network segmentation to limit access to Tenable Security Center to authorized administrative networks only

Patch Information

Tenable has released a security update addressing this vulnerability. Administrators should consult the Tenable Security Advisory TNS-2026-07 for specific version information and upgrade instructions. The patch implements proper authorization validation to ensure that users can only access resources associated with their own identity and assigned permissions.

Workarounds

• Restrict network access to Tenable Security Center using firewall rules to limit exposure to trusted networks and users only
• Implement additional authentication factors for administrative operations until the patch can be applied
• Deploy a web application firewall with custom rules to inspect and validate the owner parameter against the authenticated session
• Disable or restrict API access for non-essential users until the vulnerability is remediated
• Increase monitoring and logging verbosity to detect any exploitation attempts while awaiting patch deployment