Is CVE-2026-29965 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-29965 being exploited in the wild.

How severe is CVE-2026-29965?

Informational severity, with a CVSS score of 8.2, published 18 May 2026.

Which products and versions are affected?

HSC Labs MailInspector 5.3.3-7.

Is there a fix for CVE-2026-29965?

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-2026-29965 attacked?

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

Am I affected by CVE-2026-29965?

Check whether anything you run is named in the advisory. 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-2026-29965: HSC MailInspector XSS in WarningUrlPage.php

CVE-2026-29965 · Severity: info · CVSS 8.2 · Published 2026-05-18

HSC MailInspector, an email security gateway used to protect corporate communications from phishing and malware, contains a vulnerability in its web management interface. An attacker can exploit this by tricking a user into clicking a malicious link, allowing the attacker to execute unauthorized scripts in the user's browser. This could lead to the theft of login credentials, session hijacking, or the manipulation of sensitive security settings.

Quick answers

Is CVE-2026-29965 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-29965 being exploited in the wild.
How severe is CVE-2026-29965?: Informational severity, with a CVSS score of 8.2, published 18 May 2026.
Which products and versions are affected?: HSC Labs MailInspector 5.3.3-7.
Is there a fix for CVE-2026-29965?: 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-2026-29965 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-29965?: Check whether anything you run is named in the advisory. 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 reflected Cross-Site Scripting (XSS) vulnerability exists in HSC MailInspector v5.3.3-7 within the '/police/WarningUrlPage.php' endpoint. The root cause is the improper neutralization of user-supplied input, specifically failing to account for alternate or obfuscated JavaScript syntax (CWE-87). An unauthenticated remote attacker can exploit this by crafting a malicious URL that, when visited by a victim, executes arbitrary JavaScript in the context of the victim's session. This can be used to bypass security controls, steal session tokens, or perform actions on behalf of the user. The vulnerability has been assigned a CVSS 3.1 base score of 8.2.

Affected products

HSC Labs MailInspector 5.3.3-7

Timeline

2026-05-18: disclosed
2026-05-18: advisory

References

This page as Markdown. Free to reuse under CC BY 4.0 with a link back.