CVE-2024-3755Public exploitNetwork attack vector

Stored script execution via unescaped Empty Calendar setting

Published May 6, 2024 · Updated Nov 21, 2024

Stored XSS in MF Gig Calendar 1.2.1 and earlier allows remote authenticated users to execute scripts through the Empty Calendar setting. The plugin accepts a closing textarea tag and script in mfgigcal_settings[message], stores the value, and renders it without sanitization or output escaping. Editor-level access or higher is required, and a user must load the affected settings page; multisite sites remain exposed when unfiltered_html is disabled.

CVSS severity5.4
Medium
EPSS probability0.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in MF Gig Calendar 1.2.1 and earlier allows remote authenticated users to execute scripts through the Empty Calendar setting. The plugin accepts a closing textarea tag and script in mfgigcal_settings[message], stores the value, and renders it without sanitization or output escaping. Editor-level access or higher is required, and a user must load the affected settings page; multisite sites remain exposed when unfiltered_html is disabled.

The record

CVE
CVE-2024-3755
Published
May 6, 2024
Updated
Nov 21, 2024
Vendor
Matthew Fries
Product
MF Gig Calendar
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 6, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 21, 2024Record 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=0 <=1.2.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Matthew Fries · MF Gig Calendarversion=0 <=1.2.1

Published CVSS scores

5.4CISA-ADPCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript/JScript

Public exploit references

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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