CVE-2026-29964 Details
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.
A Cross-Site Scripting (XSS) vulnerability has been identified in HSC MailInspector version 5.3.3-7. The issue resides in the '/mailinspector/tap/tap.php' endpoint, where user input is not properly sanitized before being reflected in HTTP responses. This flaw allows remote attackers to execute arbitrary JavaScript in the context of the victim's browser, potentially leading to session hijacking, content manipulation, or phishing attacks.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed May 18, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/sql3t0/cve-disclosures | [email protected] | Third Party Advisory |
| https://github.com/sql3t0/cve-disclosures/blob/main/03_-_CVE-2026-29964_XSS.md | [email protected] | Third Party Advisory |
| https://hsclabs.com/pt-br/mailinspector/ | [email protected] | Product |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-79 | Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') | CISA-ADP |
Affected Products
| Product | Versions |
|---|---|
| hsclabs mailinspector | 5.3.3-7 |
CPE
Remediation
| |
Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| May 19, 2026 | Initial Analysis | [email protected] |
| May 18, 2026 | CVE Modified | CISA-ADP |
| May 18, 2026 | New CVE Received | [email protected] |