CVE-2022-4320Public exploitNetwork attack vector

Unauthenticated script execution via AJAX parameter reflection

Published Jan 16, 2023 · Updated Apr 4, 2025

Reflected XSS in MH Software connectDaily Events Calendar Plugin before 1.4.5 allows remote attackers to execute script via AJAX requests. The cd_displayday, cd_calendar, and cd_dismisshint AJAX subactions return the by_id, id, or callback parameter in HTML without context-appropriate encoding. A victim must open a crafted URL, and most demonstrated payloads require at least one configured calendar; script runs in that visitor’s browser context.

CVSS severity6.1
Medium
EPSS probability0.89%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in MH Software connectDaily Events Calendar Plugin before 1.4.5 allows remote attackers to execute script via AJAX requests. The cd_displayday, cd_calendar, and cd_dismisshint AJAX subactions return the by_id, id, or callback parameter in HTML without context-appropriate encoding. A victim must open a crafted URL, and most demonstrated payloads require at least one configured calendar; script runs in that visitor’s browser context.

The record

CVE
CVE-2022-4320
Published
Jan 16, 2023
Updated
Apr 4, 2025
Vendor
MH Software, Inc.
Product
connectDaily Events Calendar Plugin
Classifications
CWE-79, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 16, 2023CVE publishedPublication date reported by the CVE source.
  2. Apr 4, 2025Record 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 <1.4.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

MH Software, Inc. · connectDaily Events Calendar Pluginversion=0 <1.4.5

Published CVSS scores

6.1CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/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 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 exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1204.001Malicious Link

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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