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Vulnerabilities

Vulnerability · CVE-2026-3045

NSquared simply_schedule_appointments Missing Authorization

Published Mar 13, 2026 · catalog updated Oct 13, 2026 · NSquared

Patch now

CVE-2026-3045 is in the CISA known-exploited catalog. Confirm NSquared against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Severity
High7.5
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
0.52%
Remediation
Remediation guidance
Affected products
vendor NSquared simply_schedule_appointments

The Appointment Booking Calendar — Simply Schedule Appointments plugin for WordPress is vulnerable to unauthorized access of sensitive data in all versions up to and including 1.6.9.29. This is due to two compounding weaknesses: (1) a non-user-bound is exposed to unauthenticated users through the public REST endpoint, and (2) the method in relies on for authorization (which accepts the public nonce) but does not call to filter restricted fields. This makes it possible for unauthenticated attackers to access admin-only plugin settings including the administrator email, phone number, internal access tokens, notification configurations, and developer settings via the endpoint. The exposure of appointment tokens also allows an attacker to modify or cancel appointments.

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.

  • vendor NSquared simply_schedule_appointmentsversion unspecified

How to fix CVE-2026-3045

What to do

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

Should you patch?

CVE-2026-3045 is in the CISA known-exploited catalog. Confirm NSquared against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Affected version ranges are not on this record. Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

What should an analyst verify?

CWE-862: Missing Authorization. EPSS 0.52%. The CISA KEV listing is the exploitation evidence. 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. Mar 13, 2026 · NIST NVD

    Detected

    The Appointment Booking Calendar — Simply Schedule Appointments plugin for WordPress is vulnerable to unauthorized access of sensitive data in all versions up to and including 1.6.9.29. This is due to two compounding weaknesses: (1) a non-user-bound is exposed to unauthenticated users through the public REST endpoint, and (2) the method in relies on for authorization (which accepts the public nonc

  2. Jun 17, 2026 · NIST NVD

    Updated

    The Appointment Booking Calendar — Simply Schedule Appointments plugin for WordPress is vulnerable to unauthorized access of sensitive data in all versions up to and including 1.6.9.29. This is due to two compounding weaknesses: (1) a non-user-bound is exposed to unauthenticated users through the public REST endpoint, and (2) the method in relies on for authorization (which accepts the public nonc

  3. Oct 13, 2026 · CISA KEV

    Known exploited

    Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

  4. Oct 13, 2026 · VulnCheck KEV

    Updated

    The Appointment Booking Calendar — Simply Schedule Appointments plugin for WordPress is vulnerable to unauthorized access of sensitive data in all versions up to and including 1.6.9.29. This is due to two compounding weaknesses: (1) a non-user-bound is exposed to unauthenticated users through the public REST endpoint, and (2) the method in relies on for authorization (which accepts the public nonc

Sources

  • CVE.orgVulnerability recordCVE-2026-3045

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-3045

    30-day exploitation probability 0.5%

    first.org
  • NIST NVDVulnerability recordCVE-2026-3045

    The Appointment Booking Calendar — Simply Schedule Appointments plugin for WordPress is vulnerable to unauthorized access of sensitive data in all versions up to and including 1.6.9.29. This is due to two compounding weaknesses: (1) a non-user-bound is exposed to u

    nvd.nist.gov
  • VulnCheck KEVConfirmed exploitationCVE-2026-3045

    The Appointment Booking Calendar — Simply Schedule Appointments plugin for WordPress is vulnerable to unauthorized access of sensitive data in all versions up to and including 1.6.9.29. This is due to two compounding weaknesses: (1) a non-user-bound is exposed to unauthenticated

    vulncheck.com

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.