CVE-2026-24523Network attack vector

Unauthenticated system-information disclosure

Published Jan 23, 2026 · Updated Jan 23, 2026

Sensitive information exposure in Marcus Sykes WP FullCalendar 1.6 and earlier allows remote attackers to retrieve system data via network requests. Patchstack has not published the affected code path, exposed fields, or request handling operation that returns the system information. No authentication or user interaction is required; the published impact is limited to reading system information, with no integrity or availability effect.

CVSS severity5.3
Medium
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Sensitive information exposure in Marcus Sykes WP FullCalendar 1.6 and earlier allows remote attackers to retrieve system data via network requests. Patchstack has not published the affected code path, exposed fields, or request handling operation that returns the system information. No authentication or user interaction is required; the published impact is limited to reading system information, with no integrity or availability effect.

The record

CVE
CVE-2026-24523
Published
Jan 23, 2026
Updated
Jan 23, 2026
Vendor
Marcus Sykes
Product
WP FullCalendar
Classifications
CWE-497, CAPEC-37, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 23, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=n/a <=<= 1.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Marcus Sykes · WP FullCalendarversion=n/a <=<= 1.6

Published CVSS scores

5.3PatchstackCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-497Exposure of Sensitive System Information to an Unauthorized Control Sphere
CAPEC-37Retrieve Embedded Sensitive Data
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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