How severe is CVE-2021-24225?

CVE-2021-24225 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2021-24225 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (48th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-24225?

CVE-2021-24225 affects Elbtide Advanced Booking Calendar. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-24225?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-24225 published?

CVE-2021-24225 was published on 2021-04-12 and last updated on 2026-06-17.

CVE-2021-24225

CVE-2021-24225 is a medium-severity vulnerability in Elbtide Advanced Booking Calendar with a CVSS 3.x base score of 5.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
CVSS v2: 3.5
EPSS exploit prediction: 1% (48th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Elbtide Advanced Booking Calendar
Published: 2021-04-12
Last modified: 2026-06-17

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

Frequently asked questions

What is CVE-2021-24225?: 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
How severe is CVE-2021-24225?: CVE-2021-24225 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2021-24225 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (48th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-24225?: CVE-2021-24225 affects Elbtide Advanced Booking Calendar. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-24225?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-24225 published?: CVE-2021-24225 was published on 2021-04-12 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:elbtide:advanced_booking_calendar:*:*:*:*:*:wordpress:*:*

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