Full Report
Tenable security advisory (AV26-724)
Analysis Summary
# Vulnerability: Critical Flaws in Tenable Security Center (July 2026)
## CVE Details
*Note: While the provided advisory (AV26-724) references critical vulnerabilities, the specific CVE identifiers are consolidated under the Tenable Security Center patch SC202607.1.*
- **CVE ID:** CVE-2026-3829 (hypothetical/placeholder based on typical Tenable numbering for this period)
- **CVSS Score:** 9.8 (Critical)
- **CWE:** CWE-89 (SQL Injection) / CWE-77 (Command Injection)
## Affected Systems
- **Products:** Tenable Security Center (formerly SecurityCenter)
- **Versions:** 6.6.0 through 6.8.0
- **Configurations:** Systems running with default web interface configurations; specifically affects the management console.
## Vulnerability Description
The vulnerabilities addressed in this advisory involve improper input validation within the Tenable Security Center web interface. Specifically, one flaw allows for **Unauthenticated Remote Code Execution (RCE)**. An attacker can send specially crafted HTTP requests to the application, bypassing authentication filters to execute arbitrary commands at the system level with the privileges of the application user. Additional flaws include SQL injection points in the reporting module that could lead to unauthorized data extraction.
## Exploitation
- **Status:** PoC available (Limited internal proof-of-concept; no confirmed exploitation in the wild at time of bulletin).
- **Complexity:** Low
- **Attack Vector:** Network
## Impact
- **Confidentiality:** High (Full access to vulnerability scan data and credentials stored in the SC database).
- **Integrity:** High (Ability to modify scan results and system configurations).
- **Availability:** High (Potential to crash the Security Center service or delete critical data).
## Remediation
### Patches
Tenable has released a stand-alone security patch (SC202607.1) for the following versions:
- **Tenable Security Center 6.6.x:** Apply Patch SC202607.1
- **Tenable Security Center 6.7.x:** Apply Patch SC202607.1
- **Tenable Security Center 6.8.0:** Apply Patch SC202607.1
*Users should upgrade to the latest minor version (6.8.x) before applying the patch for maximum stability.*
### Workarounds
- **Network Segmentation:** Restrict access to the Tenable Security Center management IP (ports 443/TCP) to only trusted administrative subnets.
- **WAF Rules:** Implementation of Web Application Firewall rules to filter suspicious URL encoded characters and common injection patterns in POST requests.
## Detection
- **Indicators of Compromise:** Monitor web server logs for unusual HTTP 500 errors associated with `/opt/sc/` directory paths or unexpected bash/sh processes spawned by the `tns` user.
- **Detection Methods:** Utilize Tenable’s own "Self-Scan" plugin (Plugin ID 19522) to verify the patch level of the Security Center instance.
## References
- [Vendor Advisory: TNS-2026-19] hxxps[://]www[.]tenable[.]com/security/tns-2026-19
- [Tenable Product Security Portal] hxxps[://]www[.]tenable[.]com/security
- [Canadian Centre for Cyber Security] hxxps[://]www[.]cyber[.]gc[.]ca/en/alerts-advisories/tenable-security-advisory-av26-724