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Vulnerability record · CVE-2026-29964 · published 18 May 2026

CVE-2026-29964: Hsclabs mailinspector cross-site scripting vulnerability

Hsclabs · Mailinspector

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.

6.1 CVSS 3.1 Medium EPSS 0.41% · top 67.6% CWE-79 · Cross-site scripting
6.1CVSS 3.1 base score
0.41%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References
17 Jun 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2024-32370Hsclabs mailinspector vulnerabilityAn issue in HSC Cybersecurity HC Mailinspector 5.2.17-3 through 5.2.18 allows a remote attacker to obtain sensitive information via a crafted payload…EPSS 1.0%8.6CVE-2024-34470Hsclabs mailinspector vulnerabilityAn issue was discovered in HSC Mailinspector 5.2.17-3 through v.5.2.18. An Unauthenticated Path Traversal vulnerability exists in the /public/loader.…EPSS 6.7%7.5CVE-2026-29962Hsclabs mailinspector vulnerabilityHSC MailInspector v5.3.3-7 contains a Local File Inclusion (LFI) vulnerability caused by improper control of user-supplied file paths. The endpoint /…EPSS 1.8%7.5CVE-2026-29963Hsclabs mailinspector path traversal vulnerabilityHSC MailInspector 5.3.3-7 has a Path Traversal vulnerability due to improper validation of user-supplied input in the /tap/dw.php endpoint. The text …EPSS 3.0%7.5CVE-2024-32371Hsclabs mailinspector improper input validation vulnerabilityAn issue in HSC Cybersecurity HC Mailinspector 5.2.17-3 through 5.2.18 allows a regular user account to escalate their privileges and gain administra…EPSS 0.70%6.1CVE-2026-29965Hsclabs mailinspector cross-site scripting vulnerabilityHSC MailInspector 5.3.3-7 is vulnerable to Cross Site Scripting (XSS) in the /police/WarningUrlPage.php endpoint due to improper neutralization of us…EPSS 0.34%5.5CVE-2024-34472Hsclabs mailinspector sql injection vulnerabilityAn issue was discovered in HSC Mailinspector 5.2.17-3 through v.5.2.18. An authenticated blind SQL injection vulnerability exists in the mliRealtimeE…EPSS 0.65%5.4CVE-2024-34471Hsclabs mailinspector path traversal vulnerabilityAn issue was discovered in HSC Mailinspector 5.2.17-3. A Path Traversal vulnerability (resulting in file deletion) exists in the mliRealtimeEmails.ph…EPSS 0.74%

Source: NIST National Vulnerability Database (record CVE-2026-29964), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.