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Vulnerabilities

Vulnerability · CVE-2026-6203

The User Registration & Membership plugin for WordPress is vulnerable to Open Redirect in versions up to and including 5.1.4.

Published Apr 13, 2026 · catalog updated Jun 17, 2026 · The User Registration &

Check if you run it

No confirmed exploitation is on record for CVE-2026-6203. EPSS is 0.56%. Act only if a listed version of The User Registration & is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (The User Registration &).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium6.1
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.56%
Remediation
Version ranges on file
Affected products
stated named in the record

The User Registration & Membership plugin for WordPress is vulnerable to Open Redirect in versions up to and including 5.1.4. This is due to insufficient validation of user-supplied URLs passed via the 'redirect_to_on_logout' GET parameter before redirecting users. The GET parameter is passed directly to WordPress's function instead of the domain-restricted . While is applied to sanitize malformed URLs, it does not restrict the redirect destination to the local domain, allowing an attacker to craft a specially formed link that redirects users to potentially malicious external URLs after logout, which could be used to facilitate phishing attacks.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • stated named in the record<= 5.1.4

How to fix CVE-2026-6203

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-6203. EPSS is 0.56%. Act only if a listed version of The User Registration & is installed.

Which versions are affected?

Compare what you have installed with named in the record <= 5.1.4. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-601: URL Redirection to Untrusted Site (Open Redirect). EPSS 0.56%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

WordPress security

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Apr 13, 2026 · NIST NVD

    Detected

    The User Registration & Membership plugin for WordPress is vulnerable to Open Redirect in versions up to and including 5.1.4. This is due to insufficient validation of user-supplied URLs passed via the 'redirect_to_on_logout' GET parameter before redirecting users. The GET parameter is passed directly to WordPress's function instead of the domain-restricted . While is applied to sanitize malformed

  2. Jun 17, 2026 · NIST NVD

    Updated

    The User Registration & Membership plugin for WordPress is vulnerable to Open Redirect in versions up to and including 5.1.4. This is due to insufficient validation of user-supplied URLs passed via the 'redirect_to_on_logout' GET parameter before redirecting users. The GET parameter is passed directly to WordPress's function instead of the domain-restricted . While is applied to sanitize malformed

Sources

  • CVE.orgVulnerability recordCVE-2026-6203

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-6203

    30-day exploitation probability 0.6%

    first.org
  • NIST NVDVulnerability recordCVE-2026-6203

    The User Registration & Membership plugin for WordPress is vulnerable to Open Redirect in versions up to and including 5.1.4. This is due to insufficient validation of user-supplied URLs passed via the 'redirect_to_on_logout' GET parameter before redirecting users. The `redirect_

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.