CVE-2026-29963Network attack vector

Unauthenticated file disclosure via path traversal

Published May 18, 2026 · Updated May 18, 2026

Path traversal in HSC MailInspector 5.3.3-7 allows remote attackers to read arbitrary files through the /tap/dw.php endpoint. The endpoint constructs filesystem paths from an untrusted request parameter without normalizing traversal sequences or enforcing a safe base directory. No authentication or user interaction is required, and the documented consequence is disclosure of system and application files without file modification or service interruption.

CVSS severity7.5
High
EPSS probability2.08%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in HSC MailInspector 5.3.3-7 allows remote attackers to read arbitrary files through the /tap/dw.php endpoint. The endpoint constructs filesystem paths from an untrusted request parameter without normalizing traversal sequences or enforcing a safe base directory. No authentication or user interaction is required, and the documented consequence is disclosure of system and application files without file modification or service interruption.

The record

CVE
CVE-2026-29963
Published
May 18, 2026
Updated
May 18, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-22, T1005
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 18, 2026CVE publishedPublication date reported by the CVE source.
  2. May 18, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1005Data from Local System

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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