CVE-2021-24356: In the Simple 301 Redirects by BetterLinks WordPress plugin before 2.0.4, a lack of capability checks and insufficient nonce check on the AJAX action, simple301redirects/admin/activate_plugin, made it

high Affects simple-301-redirects (WordPress plugin). Feed 2026.10.29.4, updated 2026-10-29; published 2021-06-14; advisory modified 2026-06-17.

In the Simple 301 Redirects by BetterLinks WordPress plugin before 2.0.4, a lack of capability checks and insufficient nonce check on the AJAX action, simple301redirects/admin/activate_plugin, made it

Package: simple-301-redirects (WordPress plugin) WordPress
Affected versions: >=2.0.0 and <2.0.4
Fixed in: 2.0.4
Severity: high CVSS 8.8
Exploitation: not on CISA KEV · EPSS 3% (85.3th percentile)
Published: 2021-06-14
Source: nvd

References

CWE-862

NVD record simple-301-redirects (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.

Install docs How findings are ranked

Related advisories

CVE-2021-24354 high A lack of capability checks and insufficient nonce check on the AJAX action in the Simple same package: simple-301-redirects (WordPress plugin)
CVE-2021-24352 high The export_data function of the Simple 301 Redirects by BetterLinks WordPress plugin befor same package: simple-301-redirects (WordPress plugin)
CVE-2021-24353 high The import_data function of the Simple 301 Redirects by BetterLinks WordPress plugin befor same package: simple-301-redirects (WordPress plugin)
CVE-2021-24355 medium In the Simple 301 Redirects by BetterLinks WordPress plugin before 2.0.4, the lack of capa same package: simple-301-redirects (WordPress plugin)
CVE-2022-1329 high The Elementor Website Builder plugin for WordPress is vulnerable to unauthorized execution same weakness: CWE-862
CVE-2023-6875 critical The POST SMTP Mailer – Email log, Delivery Failure Notifications and Best Mail SMTP for Wo same weakness: CWE-862