CVE-2026-59558: wpdevelop Booking Calendar unauthenticated XSS

CVE-2026-59558 · Severity: high · CVSS 7.1 · Published 2026-07-27

The Booking Calendar plugin for WordPress, which provides online reservation and scheduling functionality, contains a security flaw that allows attackers to inject malicious scripts into the website. If a site administrator or visitor interacts with a specially crafted link or page, the attacker could potentially hijack user sessions, redirect visitors to malicious websites, or deface the site. This vulnerability can be exploited by remote attackers without needing any login credentials.

Technologies: Wpdevelop Booking Calendar. Vendors: Wpdevelop.

Quick answers

Is CVE-2026-59558 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-59558 being exploited in the wild.
How severe is CVE-2026-59558?
High severity, with a CVSS score of 7.1, published 27 July 2026.
Which products and versions are affected?
Wpdevelop Booking Calendar <= 11.4.2.
Is there a fix for CVE-2026-59558?
A patch was published on 2026-07-27: Fixed in version 11.4.3 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-59558 attacked?
It is attacked over the network, in a software library.
Am I affected by CVE-2026-59558?
Check whether you run Wpdevelop Booking Calendar at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A Reflected Cross-Site Scripting (XSS) vulnerability exists in the Booking Calendar plugin for WordPress (versions <= 11.4.2) due to improper neutralization of user-supplied input during web page generation (CWE-79). The flaw allows an unauthenticated remote attacker to execute arbitrary JavaScript in the context of a victim's browser session. Exploitation requires a victim (typically a site administrator) to perform an action, such as clicking a malicious link or visiting a crafted URL. This can lead to session hijacking, unauthorized administrative actions, or the delivery of further browser-based exploits. The issue is resolved in version 11.4.3.

Affected products

  • wpdevelop Booking Calendar <= 11.4.2

Timeline

  • 2026-07-16: disclosed: Reported by researcher daroo to Patchstack
  • 2026-07-27: advisory: Published by Patchstack and NVD
  • 2026-07-27: patched: Fixed in version 11.4.3

References

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