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CVE-2021-43409

22
FAUCET Score

CVE-2021-43409 is a persistent Cross-Site Scripting (XSS) vulnerability affecting the WPO365 | LOGIN WordPress plugin up to version 15.3. This flaw allows an unauthenticated attacker to inject malicious scripts that execute when a WordPress administrator accesses the dashboard. The vulnerability has a CVSS score of 6.1 (Medium) due to its low attack complexity and potential for session hijacking, account takeover, and full system control. While there are no known active exploits or public exploit code (Metasploit, Nuclei, ExploitDB), the vulnerability has garnered significant community discussion, indicating awareness and potential for future exploitation.

Impacted Technologies

VendorProductVersion(s)CPE
<= 15.3CPE matchmatch criteria
cpe:2.3:a:wpo365:wordpress_\+_azure_ad_\/_microsoft_office_365:*:*:*:*:*:wordpress:*:*

CVSS Data

CVSS version used by this source: 3.1

9.3CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
5.8
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.94%
Probability of exploitation in next 30 days
EPSS Percentile
57.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0094 is in the 69th percentile among its peer group of 26,219 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

appcheck-ng.com / wordpress-microsoft-office-365-azure-ad-login-persistent-cross-site-scripting
ExploitThird Party Advisory
wpo365.com / change-log
Release NotesVendor Advisory