Stored Cross-Site Scripting in QuickCal Plugin for WordPress
CVE-2026-15984

7.2HIGH

Key Information:

Vendor

WordPress
Status
Quickcal
Vendor
CVE Published:
5 September 2026

What is CVE-2026-15984?

The QuickCal plugin for WordPress is vulnerable to Stored Cross-Site Scripting due to inadequate input sanitization and output escaping. This vulnerability affects all versions up to and including 1.0.20, allowing unauthenticated attackers to inject malicious web scripts into pages. Whenever a user accesses an affected page, these scripts can execute, potentially compromising site security. Additionally, a nonce used to protect an unauthenticated action is publicly available on any page that renders the booking calendar shortcode, simplifying exploitation without requiring user privileges.

Affected Version(s)

QuickCal 0 <= 1.0.20

References

https://www.wordfence.com/threat-intel/vulnerabilities/id...
https://codecanyon.net/item/quickcal-appointment-booking-...

CVSS V3.1

Score:
7.2
Severity:
HIGH
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

adhikara13
.