# CVE-2026-6377: CSM (Customer Service Management) - Path Traversal

> Live exploitation tracking for CVE-2026-6377 by the CrowdSec Live Exploit Tracker, built from real-world attack data crowdsourced from CrowdSec's global network.

Page: https://tracker.crowdsec.net/cves/CVE-2026-6377

## Key facts

- **Exploitation phase:** Limited Exploitation. The vulnerability is known but shows very limited attacker interest or exploitation activity.
- **CVSS score:** 7.5
- **Public exploit available:** Yes
- **Affected products:** Next4Biz Information Technologies Inc. CSM (Customer Service Management)
- **Weaknesses:** CWE-22 (Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal'))
- **Tags:** enterprise_software, web_application

## Description

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') vulnerability in Next4Biz Information Technologies Inc. CSM (Customer Service Management) allows Path Traversal.

This issue affects CSM (Customer Service Management): from 6.8.9 before 8.0.3.

## CrowdSec analysis

[CVE-2026-6377](https://euvd.enisa.europa.eu/vulnerability/CVE-2026-6377) is a high-severity path traversal vulnerability in Next4Biz CSM (Customer Service Management), affecting versions from 6.8.9 to before 8.0.3. Because the flaw is remotely exploitable without authentication, attackers may access files outside restricted directories and expose sensitive information.

CrowdSec has been tracking this vulnerability and its exploits since 20th of October 2026.

CrowdSec has not observed any significant exploitation activity targeting CVE-2026-6377 across its network. As a result, no community-driven trend analysis is available for this vulnerability at this time.

Attackers target `/Handlers/DownloadFileHandler.ashx` and provide an absolute Windows file path in the `file` parameter to attempt unauthenticated arbitrary file reads.

## Timeline

- 2026-09-07: CVE Published. CVE-2026-6377 is published to NVD.
- 2026-10-20: Rule Released. CrowdSec releases a rule to detect CVE-2026-6377 exploitation attempts against the CrowdSec Network.
- 2026-10-21: First exploitation attempt seen by CrowdSec

## References

- https://siberguvenlik.gov.tr/guvenlik-bildirimleri/detay/tr-26-1027
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-6377.yaml

## Live exploitation data

The [Live Exploit Tracker page](https://tracker.crowdsec.net/cves/CVE-2026-6377) follows observed exploitation activity for CVE-2026-6377. [Request an API key](https://tracker.crowdsec.net/request-api-key) for full access to its exploitation timeline, attacking IP addresses and blocklists.