How severe is CVE-2021-28975?

CVE-2021-28975 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-2021-28975 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-28975?

CVE-2021-28975 affects Wpmailster Wp Mailster. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-28975?

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

When was CVE-2021-28975 published?

CVE-2021-28975 was published on 2021-10-21 and last updated on 2026-06-17.

CVE-2021-28975

CVE-2021-28975 is a medium-severity vulnerability in Wpmailster Wp Mailster 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)
CVSS v2: 4.3
EPSS exploit prediction: 1% (54th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Wpmailster Wp Mailster
Published: 2021-10-21
Last modified: 2026-06-17

Description

WP Mailster 1.6.18.0 allows XSS when a victim opens a mail server's details in the mst_servers page, for a crafted server_host, server_name, or connection_parameter parameter.

Frequently asked questions

What is CVE-2021-28975?: WP Mailster 1.6.18.0 allows XSS when a victim opens a mail server's details in the mst_servers page, for a crafted server_host, server_name, or connection_parameter parameter.
How severe is CVE-2021-28975?: CVE-2021-28975 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-2021-28975 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-28975?: CVE-2021-28975 affects Wpmailster Wp Mailster. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-28975?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-28975 published?: CVE-2021-28975 was published on 2021-10-21 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:wpmailster:wp_mailster:1.6.18:*:*:*:*:wordpress:*:*

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