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Vulnerabilities

Vulnerability · CVE-2025-4667

The Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's ssa_admin_upcoming

Published Jun 14, 2025 · catalog updated Apr 8, 2026 · Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin

Check if you run it

No confirmed exploitation is on record for CVE-2025-4667. EPSS is 0.29%. Act only if a listed version of Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium6.4
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.29%
Remediation
Vendor / distro source
Affected products
vendor croixhaug Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin 0 ≤1.6.8.30

The Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's ssa_admin_upcoming_appointments, ssa_admin_upcoming_appointments, and ssa_past_appointments shortcodes in all versions up to, and including, 1.6.8.30 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

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 croixhaug Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin 0 ≤1.6.8.300 ≤1.6.8.30

How to fix CVE-2025-4667

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-2025-4667. EPSS is 0.29%. Act only if a listed version of Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin is installed.

Which versions are affected?

Compare what you have installed with croixhaug Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin 0 ≤1.6.8.30 0 ≤1.6.8.30. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.29%. 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. Jun 14, 2025 · EUVD

    Detected

    The Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's ssa_admin_upcoming_appointments, ssa_admin_upcoming_appointments, and ssa_past_appointments shortcodes in all versions up to, and including, 1.6.8.30 due to insufficient input sanitization and output escaping on user supplied attributes.

  2. Apr 8, 2026 · EUVD

    Updated

    The Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's ssa_admin_upcoming_appointments, ssa_admin_upcoming_appointments, and ssa_past_appointments shortcodes in all versions up to, and including, 1.6.8.30 due to insufficient input sanitization and output escaping on user supplied attributes.

Sources

  • CVE.orgVulnerability recordCVE-2025-4667

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-4667

    30-day exploitation probability 0.3%

    first.org
  • EUVDVulnerability recordEUVD-2025-18338

    The Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's ssa_admin_upcoming_appointments, ssa_admin_upcoming_appointments, and ssa_past_appointments shortcodes in all versions

    euvd.enisa.europa.eu

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.