CVE-2023-51520: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in WPdevelo

Q: How do I fix CVE-2023-51520?

booking calendar: upgrade to 9.7.4. Exact commands for each OS are on this page.

Q: Is CVE-2023-51520 being exploited?

CVE-2023-51520 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2023-51520 affect?

CVE-2023-51520 affects booking calendar. Severity is medium (CVSS 6.5). Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in WPdevelop / Oplugins WP Booking Calendar allows Stored XSS.This issue affects WP Booking Calendar: from n/a before 9.7.4.

Q: How urgent is CVE-2023-51520?

Priority 29/100. No elevated risk signals yet.

Routine

MEDIUM 6.5UPGRADE

CVE-2023-51520 is a medium-severity flaw (CVSS 6.5) affecting booking calendar. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in WPdevelop / Oplugins WP Booking Calendar allows Stored XSS.This issue affects WP Booking Calendar: from n/a before 9.7.4.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.3% (top 74%)
CISA exploited list	No
Weakness	CWE-79
Published	2024-02-01
Last modified	2026-06-17

Publisher (CNA): Patchstack · Vendor: wpbookingcalendar

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2024-02-01 12:15 UTCPublished CVE record published
2026-06-17 06:41 UTCUpdated Record last modified

wpbookingcalendar booking calendar UPGRADE

Affected: < 9.7.4

Fixed in: 9.7.4

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy booking-calendar || rpm -q booking-calendar || booking-calendar --version

2. UPGRADE to 9.7.4 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade booking-calendar

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade booking-calendar

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2023-51520?

booking calendar: upgrade to 9.7.4. Exact commands for each OS are on this page.

Is CVE-2023-51520 being exploited?

CVE-2023-51520 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2023-51520 affect?

CVE-2023-51520 affects booking calendar. Severity is medium (CVSS 6.5). Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in WPdevelop / Oplugins WP Booking Calendar allows Stored XSS.This issue affects WP Booking Calendar: from n/a before 9.7.4.

How urgent is CVE-2023-51520?

Priority 29/100. No elevated risk signals yet.

Related CVEs

CVE-2024-6930 MEDIUM 6.4 UPGRADE The WP Booking Calendar plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'type' attri
CVE-2024-1207 CRITICAL 9.8 UPGRADE The WP Booking Calendar plugin for WordPress is vulnerable to SQL Injection via the 'calendar_request_params[d
CVE-2024-13821 MEDIUM 5.3 UPGRADE The WP Booking Calendar plugin for WordPress is vulnerable to Unauthenticated Post-Confirmation Booking Manipu
CVE-2024-10856 MEDIUM 6.5 UPGRADE The Booking Calendar WpDevArt plugin is vulnerable to time-based, blind SQL injection via the `id` parameter i
CVE-2023-24407 MEDIUM 5.0 UPGRADE Missing Authorization vulnerability in WpDevArt Booking calendar, Appointment Booking System allows Exploiting

References

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