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CVE-2021-42549

21
FAUCET Score

CVE-2021-42549 describes a reflected Cross-Site Scripting (XSS) vulnerability in the search functionality of the WordPress plugin Lets-Box, affecting versions prior to 1.15.3. This medium-severity flaw (CVSS 6.1) allows unauthenticated attackers to inject malicious scripts into a user's browser due to insufficient input validation. While no active exploitation, public exploit code, or significant community discussion has been observed, the vulnerability could lead to information disclosure or session hijacking.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.15.3CPE matchmatch criteria
cpe:2.3:a:wpcloudplugins:lets-box:*:*:*:*:*:wordpress:*:*

CVSS Data

CVSS version used by this source: 3.1

4.7MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
NONE
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.73%
Probability of exploitation in next 30 days
EPSS Percentile
50.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0073 is in the 57th percentile among its peer group of 26,220 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

wpcloudplugins.com / wp-content/plugins/lets-box/_documentation/index.html
Third Party Advisory