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CVE-2021-28975

20
FAUCET Score

CVE-2021-28975 is a Cross-Site Scripting (XSS) vulnerability affecting WP Mailster 1.6.18.0. This flaw allows an attacker to inject malicious scripts when a user views mail server details containing specially crafted server_host, server_name, or connection_parameter values. Rated 6.1 MEDIUM, the vulnerability requires user interaction (UI:R) and could lead to low impact on confidentiality and integrity (C:L/I:L). There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
1.6.18CPE matchmatch criteria
cpe:2.3:a:wpmailster:wp_mailster:1.6.18:*:*:*:*:wordpress:*:*

CVSS Data

CVSS version used by this source: 3.1

6.1MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
2.7
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.87%
Probability of exploitation in next 30 days
EPSS Percentile
55.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0087 is in the 65th percentile among its peer group of 26,221 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

compass-security.com / en/research/advisories
Third Party Advisory
compass-security.com / fileadmin/Research/Advisories/2021-18_CSNC-2021-018-WPMailster_XSS_CSRF.txt
ExploitThird Party Advisory