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Cross-site Scripting (XSS)Weakness · CWE-79

CVE-2026-42663

MEDIUM · 6.5 CVSS v3.1 Published 2026-06-15
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
69/100
Remediation priority · Elevated
Remotely reachable

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
Unauthenticated Cross Site Scripting (XSS) in Simple Membership <= 4.7.2 versions.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · moderate confidence

Unauthenticated Cross Site Scripting (XSS) vulnerability in Simple Membership plugin for WordPress versions 4.7.2 and below allows attackers to inject malicious scripts without authentication.

MitigationUpdate Simple Membership plugin to a version beyond 4.7.2, or disable the plugin until a patched version is available.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
Low

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

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Check if Simple Membership plugin is installed
    Inspect the WordPress plugins directory at /wp-content/plugins/ or use the WordPress admin dashboard under Plugins to confirm the Simple Membership plugin is present
    Affected if The plugin folder 'simple-membership' exists in the WordPress plugins directory
  2. Determine the installed version of Simple Membership
    Access the WordPress admin Plugins page and view the version listed under Simple Membership, or open the plugin main file /wp-content/plugins/simple-membership/simple-membership.php and locate the Version header comment
    Affected if The displayed version is 4.7.2 or any version number lower than 4.7.2
  3. Confirm the plugin is active
    Check the WordPress admin Plugins page to verify the Simple Membership plugin is activated, or query the WordPress database via SQL: SELECT status FROM wp_options WHERE option_name LIKE '%simple_membership%'
    Affected if The plugin is enabled and processing requests on the site

If Simple Membership plugin version 4.7.2 or below is installed and active in WordPress, the environment is affected by this unauthenticated XSS vulnerability.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

From vendor data
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Update Simple Membership plugin to a version beyond 4.7.2, or disable the plugin until a patched version is available.

Have this fixed Scoped from the published advisory
  • Consultation1.0 h
  • Implementation1.0 h
  • Testing2.0 h
  • Review / QA1.0 h
5.0 hours of engineering $860
Get help mitigating

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,376.

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-42663 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data