CVE-2024-7877: The Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin WordPress plugin before 1.6.7.5

Q: How do I fix CVE-2024-7877?

simply schedule appointments: upgrade to 1.6.7.55. Exact commands for each OS are on this page.

Q: Is CVE-2024-7877 being exploited?

CVE-2024-7877 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2024-7877 affect?

CVE-2024-7877 affects simply schedule appointments. Severity is medium (CVSS 4.8). 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

Q: How urgent is CVE-2024-7877?

Priority 30/100. Public exploit reference

Routine

MEDIUM 4.8UPGRADE

CVE-2024-7877 is a medium-severity flaw (CVSS 4.8) affecting simply schedule appointments. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	4.8 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	Required
EPSS exploit chance	0.4% (top 67%)
CISA exploited list	No
Weakness	CWE-79
Published	2024-11-05
Last modified	2026-06-17

Publisher (CNA): WPScan · Vendor: nsqua

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2024-11-05 06:15 UTCPublished CVE record published
2026-06-17 08:21 UTCUpdated Record last modified

nsqua simply schedule appointments UPGRADE

Affected: < 1.6.7.55

Fixed in: 1.6.7.55

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy simply-schedule-appointments || rpm -q simply-schedule-appointments || simply-schedule-appointments --version

2. UPGRADE to 1.6.7.55 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade simply-schedule-appointments

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade simply-schedule-appointments

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2024-7877?

simply schedule appointments: upgrade to 1.6.7.55. Exact commands for each OS are on this page.

Is CVE-2024-7877 being exploited?

CVE-2024-7877 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2024-7877 affect?

CVE-2024-7877 affects simply schedule appointments. Severity is medium (CVSS 4.8). 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

How urgent is CVE-2024-7877?

Priority 30/100. Public exploit reference

Software pages

WordPress vulnerabilities

Related CVEs

CVE-2024-7876 MEDIUM 4.8 UPGRADE The Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin WordPress plugin before 1.6.7.5
CVE-2024-7129 HIGH 7.2 UPGRADE The Appointment Booking Calendar WordPress plugin before 1.6.7.43 does not escape template syntax provided via

References

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