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TI-2026-13386 Aliases CVE-2026-15984GHSA-3566-c9r4-mj76

QuickCal <= 1.0.20 - Unauthenticated Stored Cross-Site Scripting via Custom Field Parameters

Priority LOW 38CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Cross-site scripting
Confidentiality · integrity · availability
Low · Low · None
Fix status
No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-79.

Summary

The QuickCal plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Custom Field Parameters in all versions up to, and including, 1.0.20 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The nonce guarding the unauthenticated booked_add_appt AJAX action is publicly embedded on any page rendering the booking calendar shortcode, making it trivially obtainable by unauthenticated attackers without any prior account or privilege.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00318 24th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
ThemovationQuickCalup to 1.0.20—No fix listedCNA
  • QuickCal VendorThemovation Affected up to 1.0.20 Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-15984
  2. 2026-10-03 Alias added: GHSA-3566-c9r4-mj76

References

Other 2

  • TI-2025-26140 Missing authorization in Themovation Bellevue CVSS 3.1MEDIUM 4.3
  • TI-2025-23396 WordPress QuickCal plugin <= 1.0.15 - Sensitive Data Exposure Vulnerability CVSS 3.1MEDIUM 4.3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences