CVE-2021-24604 - CVE House
Back to Database
Status published Medium CVE-2021-24604

Availability Calendar < 1.2.2 - Authenticated Stored Cross-Site Scripting

Vulnerability Description

The Availability Calendar WordPress plugin before 1.2.2 does not sanitise or escape its Category Names before outputting them in page/post where the associated shortcode is embed, allowing high privilege users to perform Cross-Site Scripting attacks even when the unfiltered_html is disallowed

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

THREAT MONITOR

Am I Vulnerable?

Launch our assessment wizard to check if your infrastructure is exposed to • CVE-2021-24604

Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

  • xiahao@webray.com.cn inc

References

More from Unknown

View All →
CVE-2025-9978
Jeg Elementor Kit < 2.7.0 - Author+ Stored XSS
Unknown 0
CVE-2025-9959
Sandbox escape in smolagents Local Python execution environment via dunder attributes
High 7.6
CVE-2025-9900
Libtiff: libtiff write-what-where
High 8.8
CVE-2025-9784
Undertow: undertow madeyoureset http/2 ddos vulnerability
High 7.5
CVE-2025-9710
Responsive Lightbox & Gallery < 2.5.3 - Unauthenticated Stored-XSS via Comments
Unknown 0

Affected Vendor

Affected Software

Availability Calendar
Vulnerable Versions:
1.2.2

Timeline

Official Publish: September 20th, 2021
Last Modified: August 3rd, 2024
Added to House: July 21st, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

Weaknesses (CWE)

CWE-79

MITRE ATT&CK TTPs

T1189 Drive-by Compromise
Initial Access
T1059.007 JavaScript
Execution
T1539 Steal Web Session Cookie
Collection
T1213 Data from Information Repositories
Collection
T1567 Exfiltration Over Web Service
Exfiltration
T1491.001 Defacement
Impact