# CVE-2026-29962: HSC MailInspector Local File Inclusion in phpunit.php

Source: https://junglewise.ai/threats/cve-2026-29962-hsc-mailinspector-local-file-inclusion-in-phpunit-php  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-05-18. Updated: 2026-05-18  
License: CC BY 4.0 with a link back

CVE-2026-29962 · Severity: info · CVSS 7.5 · Published 2026-05-18

HSC MailInspector, an email security gateway used to protect organizations from phishing and malware, contains a vulnerability that allows unauthorized access to system files. By sending a specially crafted request to a specific component, an attacker can bypass security restrictions to read sensitive configuration files, credentials, or application data. This could lead to the exposure of administrative secrets or provide a foothold for further attacks on the corporate network.

Technologies: [HSC MailInspector](https://junglewise.ai/threats/technologies/mailinspector). Vendors: [HSC](https://junglewise.ai/threats/vendors/hsc).

## Quick answers

**Is CVE-2026-29962 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-29962 being exploited in the wild.

**How severe is CVE-2026-29962?** Informational severity, with a CVSS score of 7.5, published 18 May 2026.

**Which products and versions are affected?** HSC MailInspector 5.3.3-7.

**Is there a fix for CVE-2026-29962?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-29962 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-29962?** Check whether you run HSC MailInspector at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A Local File Inclusion (LFI) and Path Traversal vulnerability exists in HSC MailInspector v5.3.3-7. The vulnerability is located in the '/vendor/phpunit/phpunit.php' endpoint, which fails to properly validate, sanitize, or restrict user-supplied file paths in its parameters. A remote, unauthenticated attacker can exploit this by using '../' sequences to traverse the file system and read sensitive files from the underlying operating system or application directories. This can result in the disclosure of API keys, database credentials, and internal architectural details. The issue is tracked as CWE-73 (External Control of File Name or Path).

## Affected products

- HSC MailInspector 5.3.3-7

## Timeline

- 2026-05-18: advisory: CVE-2026-29962 published by NVD/MITRE

## References

- [https://github.com/sql3t0/cve-disclosures](https://github.com/sql3t0/cve-disclosures)
- [https://github.com/sql3t0/cve-disclosures/blob/main/01_-_CVE-2026-29962_LFI%2BPath_Traversal.md](https://github.com/sql3t0/cve-disclosures/blob/main/01_-_CVE-2026-29962_LFI%2BPath_Traversal.md)
- [https://hsclabs.com/pt-br/mailinspector](https://hsclabs.com/pt-br/mailinspector)

## Related threats

- [HSC MailInspector path traversal in /tap/dw.php](https://junglewise.ai/threats/cve-2026-29963-hsc-mailinspector-path-traversal-in-tap-dw-php)