CVE-2024-11855

Koalendar – Events & Appointments Booking Calendar <= 1.0.2 - Authenticated (Contributor+) Stored Cross-Site Scripting via height Parameter

6.4 Medium

The Koalendar – Events & Appointments Booking Calendar plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the ‘height’ parameter in all versions up to, and including, 1.0.2 due to insufficient input sanitization and output escaping. 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.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: Low
User interaction: None

What an attacker can affect

Confidentiality: Low
Integrity: Low
Availability: None

Exploit likelihood

0.38%Up 0.3 points since Dec 14, 2024

What each source reports

CVE List Score used 6.4

Koalendar – Events & Appointments Booking Calendar <= 1.0.2 - Authenticated (Contributor+) Stored Cross-Site Scripting via height Parameter

Record: CVE-2024-11855
CVSS 3.1: 6.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Weakness: CWE-79
Updated: 2026-11-02

EUVDEUVD-2024-34276 6.4

Record: EUVD-2024-34276
CVSS 3.1: 6.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Updated: 2026-11-02

GitHub AdvisoriesGHSA-c57q-gwwj-4953 6.4

The Koalendar – Events & Appointments Booking Calendar plugin for WordPress is vulnerable to...

Record: GHSA-c57q-gwwj-4953
CVSS 3.1: 6.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Weakness: CWE-79
Updated: 2026-11-02

NVD 6.4

Record: CVE-2024-11855
CVSS 3.1: 6.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Weakness: CWE-79
Updated: 2026-11-02

Affected products

koalendar – easy appointment scheduling & booking plugin

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2024-11855 is a medium vulnerability (CVSS 6.4) in Koalendar – Easy Appointment Scheduling & Booking Plugin, published December 14, 2024. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.38%, the 31st percentile. No source names a fixed version.