CVE-2016-20084Public exploitNetwork attack vectorHinoki check available

Unauthenticated stored XSS via calendar settings

Published Jun 15, 2026 · Updated Jun 15, 2026

Stored XSS in CodePeople Booking Calendar Contact Form 1.1.24 and earlier allows remote attackers to inject scripts via GET requests. The appointment-booking-calendar admin.php handler accepts the ict, ics, and calendar name parameters without authorization or effective sanitization, stores them as calendar options, and later renders the values into calendar or administration pages. No account is required to alter the settings; script execution occurs when a visitor displays an affected calendar or an administrator opens the plugin interface.

CVSS severity5.1
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Stored XSS in CodePeople Booking Calendar Contact Form 1.1.24 and earlier allows remote attackers to inject scripts via GET requests. The appointment-booking-calendar admin.php handler accepts the ict, ics, and calendar name parameters without authorization or effective sanitization, stores them as calendar options, and later renders the values into calendar or administration pages. No account is required to alter the settings; script execution occurs when a visitor displays an affected calendar or an administrator opens the plugin interface.

The record

CVE
CVE-2016-20084
Published
Jun 15, 2026
Updated
Jun 15, 2026
Vendor
CodePeople
Product
Booking Calendar Contact Form
Classifications
CWE-79, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 15, 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=0 <=1.1.24

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

CodePeople · Booking Calendar Contact Formversion=0 <=1.1.24

Published CVSS scores

5.1VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
7.2VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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')
T1189Drive-by Compromise

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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