CVE-2026-6377: 
Grafana Analyse et atténuation des vulnérabilités

CVE-2026-6377 is a Path Traversal vulnerability (CWE-22) in Next4Biz Information Technologies Inc.'s CSM (Customer Service Management) platform that allows unauthenticated remote attackers to read arbitrary files outside the intended restricted directory. It affects CSM versions from 6.8.9 through 07092026. The vulnerability was disclosed on September 7, 2026, by TR-CERT (Turkey's national CERT), with the vendor reportedly not responding to early disclosure attempts. It carries a CVSS v3.1 base score of 7.5 (High) (GitHub Advisory, Red Hat Bugzilla).

The vulnerability is classified as CWE-22 (Improper Limitation of a Pathname to a Restricted Directory) and stems from insufficient neutralization of special path elements (e.g., ../) in file path operations within the CSM application. An unauthenticated attacker can craft malicious HTTP requests containing directory traversal sequences to access files outside the web application's restricted root directory. No authentication or user interaction is required, and the attack can be performed remotely over the network with low complexity. Relevant attack patterns include CAPEC-126 (Path Traversal), CAPEC-64 (Using Slashes and URL Encoding to Bypass Validation), and CAPEC-78/79 (Using Escaped/Alternate Encoding of Slashes) (GitHub Advisory).

Successful exploitation results in high confidentiality impact, enabling an unauthenticated attacker to read sensitive files stored on the server — such as configuration files, credentials, application source code, or system files — without any integrity or availability impact. The attack surface is network-accessible, meaning any internet-exposed CSM instance is at risk. Exposure of credentials or configuration data could facilitate further lateral movement or privilege escalation within the affected environment (GitHub Advisory, Red Hat Bugzilla).

As of the disclosure date (September 7, 2026), there is no public proof-of-concept exploit and no evidence of active in-the-wild exploitation. The EPSS score is 0.0, reflecting a currently low probability of exploitation. The vulnerability has not been added to the CISA KEV catalog. No threat actor attribution has been reported. A blog post referencing the CVE appeared at 1dayexploit.com shortly after disclosure, though no weaponized exploit code has been confirmed (GitHub Advisory).

1. Reconnaissance: Identify internet-facing Next4Biz CSM instances (versions 6.8.9 through 07092026) using search engines like Shodan or Censys, or by fingerprinting the application via HTTP response headers or login page characteristics.
2. Identify traversal endpoint: Locate file-serving or file-download endpoints within the CSM application that accept user-supplied file path parameters (e.g., a document download or attachment retrieval endpoint).
3. Craft traversal payload: Construct an HTTP request with a path traversal sequence in the file path parameter, such as ../../../../etc/passwd or URL-encoded variants like %2e%2e%2f%2e%2e%2fetc%2fpasswd, to bypass input validation.
4. Send the request: Submit the crafted request to the vulnerable endpoint without any authentication credentials.
5. Retrieve sensitive files: If successful, the server returns the contents of the targeted file (e.g., /etc/passwd, application configuration files containing database credentials, or private keys), which can be used for further attacks (GitHub Advisory).

• Network: Unusual HTTP requests to CSM file-serving endpoints containing path traversal sequences such as ../, %2e%2e%2f, %252e%252e%252f, or similar encoded variants in URL parameters or request bodies.
• Logs: Web server or application access logs showing repeated requests to file download/retrieval endpoints with traversal patterns; HTTP 200 responses to requests referencing system files (e.g., /etc/passwd, /etc/shadow, web.config).
• File System: No direct file system artifacts expected from read-only path traversal; however, monitor for unexpected access to sensitive files in OS or application directories via file access auditing (e.g., Linux auditd rules on /etc/passwd, /etc/shadow, application config files).

A patch is available; organizations should apply it immediately by referencing the advisory at the GitHub Advisory Database (GHSA-29jq-798g-w68h). As interim workarounds: restrict network access to the CSM application to trusted networks only using firewall rules or network segmentation; implement a web application firewall (WAF) rule to detect and block path traversal sequences in HTTP requests; and enforce strict input validation and canonicalization for all file path operations within the application. Monitor file access logs for suspicious traversal attempts as an additional detection measure (GitHub Advisory).

The vulnerability was assigned and disclosed by TR-CERT (Turkey's national CERT), which published a security advisory at siberguvenlik.gov.tr. Red Hat's Product Security team tracked the issue via Bugzilla (Bug 2529481) with a high severity rating, though no Red Hat products appear directly affected. The vendor, Next4Biz Information Technologies Inc., did not respond to early disclosure attempts, which is noted in the CVE description. No significant broader community or media commentary has been identified beyond standard vulnerability database aggregation (Red Hat Bugzilla, GitHub Advisory).