CVE-2026-29965: HSC MailInspector 5.3.3-7 is vulnerable to Cross Site Scripting (XSS) in the /police/WarningUrlPage.php endpoi

Routine

MEDIUM 6.1DOWNGRADE

CVE-2026-29965 is a medium-severity flaw (CVSS 6.1) 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 is vulnerable to Cross Site Scripting (XSS) in the /police/WarningUrlPage.php endpoint due to improper neutralization of user-supplied input that uses alternate or obfuscated JavaScript syntax.

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.2% (top 91%)
CISA exploited list	No
Weakness	CWE-79
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.

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-2026-29965?

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

Is CVE-2026-29965 being exploited?

CVE-2026-29965 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-2026-29965 affect?

CVE-2026-29965 affects mailinspector. Severity is medium (CVSS 6.1). HSC MailInspector 5.3.3-7 is vulnerable to Cross Site Scripting (XSS) in the /police/WarningUrlPage.php endpoint due to improper neutralization of user-supplied input that uses alternate or obfuscated JavaScript syntax.

How urgent is CVE-2026-29965?

Priority 24/100. No elevated risk signals yet.

Software pages

PHP vulnerabilities

Related CVEs

CVE-2026-29963 HIGH 7.5 DOWNGRADE HSC MailInspector 5.3.3-7 has a Path Traversal vulnerability due to improper validation of user-supplied input
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

References

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