CVE-2026-29964

Summary

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.

Affected Software

Weaknesses

• n/a

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: partial

References

• https://hsclabs.com/pt-br/mailinspector/
• https://github.com/sql3t0/cve-disclosures
• https://github.com/sql3t0/cve-disclosures/blob/main/03_-_CVE-2026-29964_XSS.md

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