dbcve.org
Missing AuthorizationWeakness · CWE-862

CVE-2026-59523

MEDIUM · 6.5 CVSS v3.1 Published 2026-07-13
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
74/100
Remediation priority · Elevated
Remotely reachable No privileges Zero-click 5 weeks old

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
Missing Authorization vulnerability in NSquared Simply Schedule Appointments simply-schedule-appointments allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects Simply Schedule Appointments: from n/a through <= 1.6.11.11.

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

Missing authorization vulnerability in the Simply Schedule Appointments WordPress plugin (versions <= 1.6.11.11) allows unauthenticated or unauthorized users to access functionality due to incorrectly configured access control security levels. This enables attackers to potentially view, modify, or delete appointment data without proper authentication or permission checks.

MitigationUpdate to the latest patched version of Simply Schedule Appointments plugin. Until patched version is available, consider disabling the plugin or restricting access via web server-level authentication.

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
None
User interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None

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

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 Simply Schedule Appointments plugin is installed
    Log in to WordPress admin panel, navigate to Plugins > Installed Plugins, and search for 'Simply Schedule Appointments' in the list.
    Affected if The plugin appears in the installed plugins list, regardless of activation status.
  2. Determine the installed plugin version
    In the Plugins list, click on 'Simply Schedule Appointments' to view the plugin details, or inspect the plugin header in /wp-content/plugins/simply-schedule-appointments/simply-schedule-appointments.php to find the 'Version' field.
    Affected if The version number displayed is 1.6.11.11 or lower.
  3. Verify WordPress user authentication requirements
    Attempt to access appointment-related AJAX endpoints or REST API routes used by the plugin (commonly /wp-json/ssa/v1/ endpoints) without providing authentication credentials using a tool like curl or browser developer tools.
    Affected if The endpoints return successful responses (200 OK) without requiring valid WordPress user authentication.
  4. Inspect plugin access control settings
    Navigate to the plugin's settings page in WordPress admin (usually under Settings > Simply Schedule Appointments) and review any access control, permissions, or security-related configuration options.
    Affected if Settings allow 'Anyone' or 'Guest' access to create, view, modify, or delete appointments without authentication.
  5. Check for unauthorized appointment records
    Access the plugin's appointment listing in WordPress admin (Appointments > All Appointments) and review the 'Customer' or 'User' column to identify appointments with no associated WordPress user account or unfamiliar email addresses.
    Affected if Appointments exist that were created by unknown users without WordPress accounts, indicating potential unauthenticated access.

A user is affected if the Simply Schedule Appointments plugin is installed with version 1.6.11.11 or lower and the plugin's endpoints or settings permit unauthenticated access to appointment data.

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 to the latest patched version of Simply Schedule Appointments plugin. Until patched version is available, consider disabling the plugin or restricting access via web server-level authentication.

Have this fixed Scoped from the published advisory
  • Consultation3.0 h
  • Implementation6.0 h
  • Testing3.0 h
  • Review / QA2.0 h
14.0 hours of engineering $2,490
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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-2026-59523 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
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