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Vulnerability record · CVE-2021-4338 · published 7 June 2023

CVE-2021-4338: Duckdev 404 to 301 improper access control vulnerability

Duckdev · 404 To 301

The 404 to 301 plugin for WordPress is vulnerable to authorization bypass due to missing capability checks on the open_redirect & save_redirect functions in versions up to, and including, 3.0.7. This makes it possible for authenticated attackers to view, create and edit redirections.

5.4 CVSS 3.1 Medium EPSS 0.62% · top 52.5% CWE-284 · Improper access controlCWE-862 · Missing authorization
5.4CVSS 3.1 base score
0.62%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
10References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

The 404 to 301 plugin for WordPress is vulnerable to authorization bypass due to missing capability checks on the open_redirect & save_redirect functions in versions up to, and including, 3.0.7. This makes it possible for authenticated attackers to view, create and edit redirections.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://blog.nintechnet.com/broken-access-control-vulnerability-fixed-in-wordpress-404-to-301-plugin/ Exploit
https://plugins.trac.wordpress.org/changeset/2546695/404-to-301 Patch
https://wpscan.com/vulnerability/9f147107-bc5a-4a01-9979-cd9e16061f12 Third Party Advisory
https://www.acunetix.com/vulnerabilities/web/wordpress-plugin-404-to-301-redirect-log-and-notify-404-errors-security-byp Third Party Advisory
https://www.wordfence.com/threat-intel/vulnerabilities/id/05d6b27f-b1e5-4bb8-b7db-f8295a5e0d5b?source=cve Third Party Advisory
https://blog.nintechnet.com/broken-access-control-vulnerability-fixed-in-wordpress-404-to-301-plugin/ Exploit
https://plugins.trac.wordpress.org/changeset/2546695/404-to-301 Patch
https://wpscan.com/vulnerability/9f147107-bc5a-4a01-9979-cd9e16061f12 Third Party Advisory
https://www.acunetix.com/vulnerabilities/web/wordpress-plugin-404-to-301-redirect-log-and-notify-404-errors-security-byp Third Party Advisory
https://www.wordfence.com/threat-intel/vulnerabilities/id/05d6b27f-b1e5-4bb8-b7db-f8295a5e0d5b?source=cve Third Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-4338), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.