CVE-2021-24225: Advanced Booking Calendar < 1.6.7 - Authenticated Reflected Cross-Site Scripting (XSS)

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2021-04-12 · updated 2026-06-17
Weakness: CWE-79

Description

The Advanced Booking Calendar WordPress plugin before 1.6.7 did not sanitise the calId GET parameter in the "Seasons & Calendars" page before outputing it in an A tag, leading to a reflected XSS issue

Affected products

Advanced Booking Calendar: before 1.6.7 — fixed in 1.6.7

How to fix

Upgrade to a fixed version: Advanced Booking Calendar 1.6.7. Check the vendor advisory for mitigations.

References

https://plugins.trac.wordpress.org/changeset/2503971/
https://wpscan.com/vulnerability/25ca8af5-ab48-4e6d-b2ef-fc291742f1d5
https://plugins.trac.wordpress.org/changeset/2503971/
https://wpscan.com/vulnerability/25ca8af5-ab48-4e6d-b2ef-fc291742f1d5

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