CVE-2023-23491Public exploitNetwork attack vector

Browser script execution via unfiltered category reflection

Published Jan 20, 2023 · Updated Apr 3, 2025

Reflected XSS in Quick Event Manager before 9.7.5 allows remote attackers to execute script in a visitor's browser via a crafted link. The qem_show_calendar() function in legacy/quick-event-manager.php reflects the qem_ajax_calendar action's category parameter into the response without filtering. Exploitation requires a visitor to open the attacker-supplied URL; the script then runs in the site's origin and can read or modify data available to that browser session.

CVSS severity6.1
Medium
EPSS probability1.18%
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 Quick Event Manager before 9.7.5 allows remote attackers to execute script in a visitor's browser via a crafted link. The qem_show_calendar() function in legacy/quick-event-manager.php reflects the qem_ajax_calendar action's category parameter into the response without filtering. Exploitation requires a visitor to open the attacker-supplied URL; the script then runs in the site's origin and can read or modify data available to that browser session.

The record

CVE
CVE-2023-23491
Published
Jan 20, 2023
Updated
Apr 3, 2025
Vendor
Fullworks Digital Ltd.
Product
Quick Event Manager
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 20, 2023CVE publishedPublication date reported by the CVE source.
  2. Apr 3, 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=< 9.7.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Fullworks Digital Ltd. · Quick Event Managerversion=< 9.7.5

Published CVSS scores

6.1CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
6.1NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
6.1Tenable ResearchCVSS: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.

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 exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

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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