CVE-2026-29964

Name: CVE-2026-29964
Creator: NVD / NIST
Published: 2026-05-18T18:17:21.65+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 0.24%

Last modified Jun 17, 2026

CVE-2026-29964 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. 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.. EPSS estimates a 0.24% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

6.1/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS Probability

0.24%

15.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Hsclabs	Mailinspector	5.3.3-7

References

https://github.com/sql3t0/cve-disclosuresThird Party Advisory
https://github.com/sql3t0/cve-disclosures/blob/main/03_-_CVE-2026-29964_XSS.mdThird Party Advisory
https://hsclabs.com/pt-br/mailinspector/Product

Timeline

Published: May 18, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-29964?

How severe is CVE-2026-29964?

CVE-2026-29964 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 0.24% probability of exploitation in the next 30 days.

How do I fix CVE-2026-29964?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-29964?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST