CVE-2026-29964 Cross-site scripting in n/a
Remote attackers can execute arbitrary JavaScript in victims' browsers via unsanitized input in the HSC MailInspector web interface.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-29964?
CVE-2026-29964 is a medium-severity cross-site scripting vulnerability in n/a, published on 18 May 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
HSC MailInspector v5.3.3-7 contains a Cross-Site Scripting (XSS) vulnerability in the /tap/tap.php endpoint due to improper neutralization of user-controlled input using alternate or obfuscated JavaScript syntax. The endpoint reflects unsanitized user input in HTTP responses without adequate output encoding, allowing a remote attacker to execute arbitrary JavaScript code in the context of a victim's browser.
Weakness: CWE-79
Which versions are affected by CVE-2026-29964?
It affects 1 product.
Products include Hsclabs Mailinspector.
How do I fix CVE-2026-29964?
No fix has been published for CVE-2026-29964 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-29964 being exploited?
There is no known exploitation of CVE-2026-29964 in the wild and no public exploit code.
Other vulnerabilities in n/a
Sources
Also known as GHSA-pjr6-wxmx-75cg.