How severe is CVE-2021-36854?

CVE-2021-36854 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity low, and availability low.

Is CVE-2021-36854 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (18th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-36854?

CVE-2021-36854 affects Bookingultrapro Booking Ultra Pro Appointments Booking Calendar. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-36854?

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

When was CVE-2021-36854 published?

CVE-2021-36854 was published on 2022-09-30 and last updated on 2026-06-17.

CVE-2021-36854

CVE-2021-36854 is a medium-severity vulnerability in Bookingultrapro Booking Ultra Pro Appointments 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-352.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
EPSS exploit prediction: 0% (18th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-352
Affected product: Bookingultrapro Booking Ultra Pro Appointments Booking Calendar
Published: 2022-09-30
Last modified: 2026-06-17

Description

Multiple Cross-Site Request Forgery (CSRF) vulnerabilities in Booking Ultra Pro plugin <= 1.1.4 at WordPress.

Frequently asked questions

What is CVE-2021-36854?: Multiple Cross-Site Request Forgery (CSRF) vulnerabilities in Booking Ultra Pro plugin <= 1.1.4 at WordPress.
How severe is CVE-2021-36854?: CVE-2021-36854 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity low, and availability low.
Is CVE-2021-36854 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (18th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-36854?: CVE-2021-36854 affects Bookingultrapro Booking Ultra Pro Appointments Booking Calendar. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-36854?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-36854 published?: CVE-2021-36854 was published on 2022-09-30 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:bookingultrapro:booking_ultra_pro_appointments_booking_calendar:*:*:*:*:*:wordpress:*:*

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CVE-2023-32511 — High (CVSS 7.1): Unauth. Reflected Cross-Site Scripting (XSS) vulnerability in Booking Ultra Pro Booking Ultra Pro Appointments Booking…
CVE-2021-36855 — Medium (CVSS 6.1): Cross-Site Scripting (XSS) via Cross-Site Request Forgery (CSRF) vulnerability in Booking Ultra Pro plugin <= 1.1.4 at…
CVE-2022-46816 — Medium (CVSS 4.3): Cross-Site Request Forgery (CSRF) vulnerability in Booking Ultra Pro Appointments Booking Calendar Plugin plugin…

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