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CVE-2021-43409: The “WPO365 | LOGIN” WordPress plugin (up to and including version 15.3) by wpo365.com is vulnerable to a persistent Cross-Site Scripting (XSS) vulnerability (also known as Stored or Second-Order XSS)

critical Affects wordpress-\+-azure-ad-\/-microsoft-office-365 (WordPress plugin). Feed 2026.10.29.4, updated 2026-10-29; published ; advisory modified .

The “WPO365 | LOGIN” WordPress plugin (up to and including version 15.3) by wpo365.com is vulnerable to a persistent Cross-Site Scripting (XSS) vulnerability (also known as Stored or Second-Order XSS)

Package
wordpress-\+-azure-ad-\/-microsoft-office-365 (WordPress plugin) WordPress
Affected versions
<=15.3
Fixed in
no fix recorded
Severity
critical  CVSS 9.3
Exploitation
not on CISA KEV · EPSS 1% (61.7th percentile)
Published
2021-11-19
Source
nvd

References

CWE-79
NVD recordwordpress-\+-azure-ad-\/-microsoft-office-365 (WordPress plugin) advisories

Am I affected?

Find out in one command. phpwarden checks your WordPress install against this advisory and 20,000+ others, ranked by real-world exploitation (CISA KEV + EPSS). Free, offline, open data.

# PHP projects (recommended)
composer require --dev phpwarden/phpwarden
# then
vendor/bin/phpwarden wordpress /var/www/html

# or, without Composer
pipx install phpwarden   &&   phpwarden wordpress /var/www/html

Or keep it checked automatically with the GitHub Action or a nightly cron; see WordPress docs.

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