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CVE-2021-39325

21
FAUCET Score

CVE-2021-39325 is a Reflected Cross-Site Scripting (XSS) vulnerability affecting the OptinMonster WordPress plugin up to version 2.6.0. This flaw stems from insufficient input validation in the load_previews function within the ~/OMAPI/Output.php file. Rated as Medium severity (CVSS 6.1), it allows unauthenticated attackers to inject arbitrary web scripts via a network-based attack requiring user interaction, potentially leading to information disclosure and limited integrity impact. There is no evidence of active exploitation, publicly available exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
<= 2.6.0CPE matchmatch criteria
cpe:2.3:a:optinmonster:optinmonster:*:*:*:*:*:wordpress:*:*
>= 2.6.0, <= 2.6.0CPE match
cpe:2.3:a:optinmonster:optinmonster:*:*:*:*:*: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
0.91%
Probability of exploitation in next 30 days
EPSS Percentile
56.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0091 is in the 67th 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

plugins.trac.wordpress.org / changeset
PatchThird Party Advisory
wordfence.com / vulnerability-advisories
Third Party Advisory