CVE-2026-29963: HSC MailInspector 5.3.3-7 has a Path Traversal vulnerability due to improper validation of user-supplied input

This month

HIGH 7.5REMOTEDOWNGRADE

CVE-2026-29963 is a high-severity flaw (CVSS 7.5) affecting mailinspector. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

HSC MailInspector 5.3.3-7 has a Path Traversal vulnerability due to improper validation of user-supplied input in the /tap/dw.php endpoint. The text parameter is used to construct file paths without adequate normalization or restriction to a safe base directory. A remote attacker can exploit this flaw to access arbitrary files on the underlying operating system, resulting in unauthorized disclosure of sensitive information.

Why this priority

High severity
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.7% (top 14%)
CISA exploited list	No
Weakness	CWE-22
Published	2026-05-18
Last modified	2026-10-19

Publisher (CNA): MITRE · Vendor: hsclabs

Last updated 2026-10-19 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-18 18:17 UTCPublished CVE record published
2026-10-19 22:10 UTCUpdated Record last modified

hsclabs mailinspector DOWNGRADE

Affected: 5.3.3-7

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.3.3-7

1. Check installed version

apt-cache policy mailinspector || rpm -q mailinspector || mailinspector --version

2. No fixed release: DOWNGRADE to a release before 5.3.3-7 (Debian / Ubuntu)

apt-cache madison mailinspector sudo apt install mailinspector=<VERSION_BEFORE_5.3.3-7> sudo apt-mark hold mailinspector

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list mailinspector sudo dnf downgrade mailinspector-<VERSION_BEFORE_5.3.3-7> sudo dnf versionlock add mailinspector

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Nuclei scan template: HSC MailInspector - Unauthenticated Arbitrary File Read

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-29963?

mailinspector: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-29963 being exploited?

CVE-2026-29963 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-29963 affect?

CVE-2026-29963 affects mailinspector. Severity is high (CVSS 7.5). HSC MailInspector 5.3.3-7 has a Path Traversal vulnerability due to improper validation of user-supplied input in the /tap/dw.php endpoint. The text parameter is used to construct file paths without adequate normalization or restriction to

How urgent is CVE-2026-29963?

Priority 53/100. High severity; Remotely exploitable, no login, no user action

Software pages

PHP vulnerabilities

Related CVEs

CVE-2026-29962 HIGH 7.5 DOWNGRADE HSC MailInspector v5.3.3-7 contains a Local File Inclusion (LFI) vulnerability caused by improper control of u
CVE-2026-29964 MEDIUM 6.1 DOWNGRADE HSC MailInspector v5.3.3-7 contains a Cross-Site Scripting (XSS) vulnerability in the /tap/tap.php endpoint du
CVE-2026-29965 MEDIUM 6.1 DOWNGRADE HSC MailInspector 5.3.3-7 is vulnerable to Cross Site Scripting (XSS) in the /police/WarningUrlPage.php endpoi

References

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