CVE-2026-24523
Published: 23 January 2026
Summary
CVE-2026-24523 is a medium-severity Exposure of Sensitive System Information to an Unauthorized Control Sphere (CWE-497) vulnerability. Its CVSS base score is 5.3 (Medium).
Operationally, exploitation aligns with the MITRE ATT&CK technique System Information Discovery (T1082); ranked at the 2.3th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
Threat & Defense at a Glance
Threat & Defense Details
Likely Mitigating ControlsAI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Ongoing reviews detect and remove sensitive system information before it reaches publicly accessible systems.
Employs detection to prevent unauthorized mining of sensitive system information from being exfiltrated to external control spheres.
Documenting where system information is processed and stored prevents exposure to unauthorized control spheres.
The control stops sensitive system information from crossing into unauthorized control spheres through EM emanations.
Authorization and minimization requirements keep PII out of test/research control spheres that often lack production-grade protections.
Documented categorization of system information reduces the chance that sensitive internals are left exposed to unauthorized spheres.
System information is concealed or replaced with decoys, reducing leakage to unauthorized observers.
Ensures sensitive system information is not disclosed outside the intended control sphere through error output.
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
The CVE describes unauthenticated network exposure of sensitive system information via a public-facing WordPress plugin, directly enabling System Information Discovery (T1082) and initial access via public application exploitation (T1190).
NVD Description
Exposure of Sensitive System Information to an Unauthorized Control Sphere vulnerability in Marcus (aka @msykes) WP FullCalendar wp-fullcalendar allows Retrieve Embedded Sensitive Data.This issue affects WP FullCalendar: from n/a through <= 1.6.
Deeper analysisAI
CVE-2026-24523 is an Exposure of Sensitive System Information to an Unauthorized Control Sphere vulnerability (CWE-497) in the WP FullCalendar WordPress plugin, developed by Marcus (aka @msykes) and known as wp-fullcalendar. The flaw allows retrieval of embedded sensitive data and affects all versions from n/a through 1.6 inclusive. Published on 2026-01-23, it carries a CVSS v3.1 base score of 5.3 (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N), indicating medium severity with low-impact confidentiality loss.
The vulnerability can be exploited by any unauthenticated attacker over the network with low complexity and no user interaction required. Exploitation enables retrieval of embedded sensitive data exposed to an unauthorized control sphere, resulting in limited disclosure of confidential system information without impacting integrity or availability.
The Patchstack advisory at https://patchstack.com/database/Wordpress/Plugin/wp-fullcalendar/vulnerability/wordpress-wp-fullcalendar-plugin-1-6-sensitive-data-exposure-vulnerability?_s_id=cve details this sensitive data exposure issue in WP FullCalendar version 1.6 and related versions.
Details
- CWE(s)