How severe is CVE-2021-25040?

CVE-2021-25040 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2021-25040 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (52nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-25040?

CVE-2021-25040 affects Booking Calendar Project Booking Calendar. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-25040?

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

When was CVE-2021-25040 published?

CVE-2021-25040 was published on 2022-01-03 and last updated on 2026-06-17.

CVE-2021-25040

CVE-2021-25040 is a medium-severity vulnerability in Booking Calendar Project Booking Calendar with a CVSS 3.x base score of 6.1. 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 6.1)
CVSS v2: 4.3
EPSS exploit prediction: 1% (52nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Booking Calendar Project Booking Calendar
Published: 2022-01-03
Last modified: 2026-06-17

Description

The Booking Calendar WordPress plugin before 8.9.2 does not sanitise and escape the booking_type parameter before outputting it back in an admin page, leading to a Reflected Cross-Site Scripting

Frequently asked questions

What is CVE-2021-25040?: The Booking Calendar WordPress plugin before 8.9.2 does not sanitise and escape the booking_type parameter before outputting it back in an admin page, leading to a Reflected Cross-Site Scripting
How severe is CVE-2021-25040?: CVE-2021-25040 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2021-25040 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (52nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-25040?: CVE-2021-25040 affects Booking Calendar Project Booking Calendar. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-25040?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-25040 published?: CVE-2021-25040 was published on 2022-01-03 and last updated on 2026-06-17.

References

https://wpscan.com/vulnerability/3ed821a6-c3e2-4964-86f8-d14c4a54708a

Affected products (1)

cpe:2.3:a:booking_calendar_project:booking_calendar:*:*:*:*:*:wordpress:*:*

More vulnerabilities in Booking Calendar Project Booking Calendar

CVE-2022-1463 — High (CVSS 8.8): The Booking Calendar plugin for WordPress is vulnerable to PHP Object Injection via the [bookingflextimeline] shortcode…
CVE-2018-20556 — High (CVSS 8.8): SQL injection vulnerability in Booking Calendar plugin 8.4.3 for WordPress allows remote attackers to execute arbitrary…
CVE-2018-5673 — High (CVSS 8.8): An issue was discovered in the booking-calendar plugin 2.1.7 for WordPress. CSRF exists via wp-admin/admin.php.
CVE-2023-36384 — High (CVSS 7.1): Unauth. Reflected Cross-Site Scripting (XSS) vulnerability in CodePeople Booking Calendar Contact Form plugin…
CVE-2017-2151 — Medium (CVSS 6.1): Cross-site scripting vulnerability in Booking Calendar version 7.1 and earlier allows remote attackers to inject…
CVE-2017-2150 — Medium (CVSS 5.3): Directory traversal vulnerability in Booking Calendar version 7.0 and earlier allows remote attackers to read arbitrary…

All CVEs affecting Booking Calendar Project Booking Calendar →

Other CWE-79 (Cross-site Scripting (XSS)) vulnerabilities

CVE-2025-49410 — Critical (CVSS 10.0): Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Imran Emu TC…
CVE-2024-47875 — Critical (CVSS 10.0): DOMPurify is a DOM-only, super-fast, uber-tolerant XSS sanitizer for HTML, MathML and SVG. DOMpurify was vulnerable to…
CVE-2024-6886 — Critical (CVSS 10.0): Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Gitea…
CVE-2023-45144 — Critical (CVSS 10.0): com.xwiki.identity-oauth:identity-oauth-ui is a package to aid in building identity and service providers based on…
CVE-2023-45138 — Critical (CVSS 10.0): Change Request is an pplication allowing users to request changes on a wiki without publishing the changes directly.…
CVE-2022-4361 — Critical (CVSS 10.0): Keycloak, an open-source identity and access management solution, has a cross-site scripting (XSS) vulnerability in the…

Browse all CWE-79 (Cross-site Scripting (XSS)) vulnerabilities →