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TI-2024-07301 Aliases CVE-2024-7877GHSA-hg63-44hg-r9q3

Appointment Booking Calendar < 1.6.7.55 - Admin+ Stored XSS

Priority MEDIUM 55CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
High
User interaction
Required
Attack complexity
Low
Impact type
Cross-site scripting
Confidentiality · integrity · availability
Low · Low · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-79.

Summary

The Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin WordPress plugin before 1.6.7.55 does not sanitise and escape some of its Notification settings, which could allow high privilege users such as admin to perform Cross-Site Scripting attacks even when unfiltered_html is disallowed

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.0039 33rd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA and NVD
Fix Fixed Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin (Unknown): 1.6.7.55

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
UnknownAppointment Booking Calendar — Simply Schedule Appointments Booking Pluginbefore 1.6.7.551.6.7.55Patch availableCNA
  • Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin VendorUnknown Affected before 1.6.7.55 Fixed in 1.6.7.55 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:nsqua:simply_schedule_appointments:*:*:*:*:*:wordpress:*:*before 1.6.7.55VulnerableNsqua
  • cpe:2.3:a:nsqua:simply_schedule_appointments:*:*:*:*:*:wordpress:*:* Versions before 1.6.7.55 Vulnerable ·Nsqua

Remediation

  • Fix · CNA Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin (Unknown) Fixed in 1.6.7.55

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin 1.6.7.55

    2 records Highest priority Priority MEDIUM 2 MEDIUM

    Other records, highest priority first

    • TI-2024-07300 Appointment Booking Calendar < 1.6.7.55 - Admin+ Stored XSSPriority MEDIUM 55
    Show all 2 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2024-7877
  2. 2026-10-03 Alias added: GHSA-hg63-44hg-r9q3

References

Exploit 1

  • TI-2024-06599 Appointment Booking Calendar < 1.6.7.43 - Admin+ Template Injection to RCE CVSS 3.1HIGH 7.2
  • TI-2024-07300 Appointment Booking Calendar < 1.6.7.55 - Admin+ Stored XSS CVSS 3.1MEDIUM 4.8
  • TI-2023-27756 WordPress Simply Schedule Appointments Plugin < 1.6.6.1 is vulnerable to SQL Injection CVSS 3.1HIGH 7.6
  • TI-2022-02189 Simply Schedule Appointments < 1.5.7.7 - Unauthenticated Email Address Disclosure CVSS 3.1MEDIUM 5.3
  • TI-2022-02190 Simply Schedule Appointments < 1.5.7.7 - Admin+ Stored Cross-Site Scripting CVSS 3.1MEDIUM 4.8

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences