Is CVE-2026-29963 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-29963 being exploited in the wild.

How severe is CVE-2026-29963?

Informational severity, with a CVSS score of 7.5, published 18 May 2026.

Is there a fix for CVE-2026-29963?

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-2026-29963 attacked?

It is attacked over the network, in a network appliance.

Am I affected by CVE-2026-29963?

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.

CVE-2026-29963: HSC MailInspector path traversal in /tap/dw.php

CVE-2026-29963 · Severity: info · CVSS 7.5 · Published 2026-05-18

HSC MailInspector, an enterprise email security gateway used to protect organizations from phishing and malware, is vulnerable to a security flaw that allows unauthorized access to system files. By sending a specially crafted web request, an attacker can bypass directory restrictions to read sensitive configuration files or system data. This could lead to the exposure of credentials, internal system details, and other confidential information stored on the appliance.

Technologies: HSC MailInspector. Vendors: HSC.

Quick answers

Is CVE-2026-29963 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-29963 being exploited in the wild.
How severe is CVE-2026-29963?: 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-2026-29963?: 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-2026-29963 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-29963?: 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 Path Traversal vulnerability exists in HSC MailInspector v5.3.3-7 within the /tap/dw.php endpoint. The application fails to properly validate or normalize user-supplied input provided via the 'ext' (or 'text' as cited in some descriptions) parameter before using it to construct file paths. A remote, unauthenticated attacker can exploit this by using directory traversal sequences (e.g., ../../) to escape the intended base directory and access sensitive files on the underlying operating system. This is classified as CWE-22 and can result in Local File Inclusion (LFI) and unauthorized disclosure of system configuration or application data.

Affected products

HSC MailInspector 5.3.3-7

Timeline

2026-05-18: disclosed: Initial vulnerability disclosure and CVE assignment
2026-05-18: advisory: NVD publication date

References

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