How severe is CVE-2026-29964?

CVE-2026-29964 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-29964 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (15th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-29964?

CVE-2026-29964 affects Hsclabs Mailinspector. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-29964?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-29964 have an EU (EUVD) identifier?

Yes. CVE-2026-29964 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-30784.

When was CVE-2026-29964 published?

CVE-2026-29964 was published on 2026-05-18 and last updated on 2026-06-17.

CVE-2026-29964

CVE-2026-29964 is a medium-severity vulnerability in Hsclabs Mailinspector with a CVSS 3.x base score of 6.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
EPSS exploit prediction: 0% (15th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-30784
Weakness: CWE-79
Affected product: Hsclabs Mailinspector
Published: 2026-05-18
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-29964?: 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.
How severe is CVE-2026-29964?: CVE-2026-29964 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-29964 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (15th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-29964?: CVE-2026-29964 affects Hsclabs Mailinspector. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-29964?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-29964 have an EU (EUVD) identifier?: Yes. CVE-2026-29964 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-30784.
When was CVE-2026-29964 published?: CVE-2026-29964 was published on 2026-05-18 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:hsclabs:mailinspector:5.3.3-7:*:*:*:*:*:*:*

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