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CVE-2021-25038

22
FAUCET Score

CVE-2021-25038 is a Reflected Cross-Site Scripting (XSS) vulnerability affecting the WordPress Multisite User Sync/Unsync plugin prior to version 2.1.2. This flaw arises from insufficient sanitization and escaping of the wmus_source_blog and wmus_record_per_page parameters, allowing an attacker to inject malicious scripts into the web page. Rated 6.1 MEDIUM on the CVSS scale, it has a low attack complexity and requires user interaction, potentially leading to limited impact on confidentiality and integrity. Currently, there is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
< 2.1.2CPE matchmatch criteria
cpe:2.3:a:obtaininfotech:multisite_user_sync\/unsync:*:*:*:*:*: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
0.80%
Probability of exploitation in next 30 days
EPSS Percentile
52.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0080 is in the 61st percentile among its peer group of 26,234 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

wpscan.com / vulnerability/72ccdcb9-3d24-41d7-b9fa-c8bd73d30aa6
ExploitThird Party Advisory