CVE-2026-111727 (GCVE-0-2026-111727)
Vulnerability from cvelistv5 – Published: 2026-10-28 03:42 – Updated: 2026-10-28 03:42
VLAI
EPSS
VEX
Title
Appointment Booking Calendar <= 1.4.05 - Authenticated (Subscriber+) Stored Cross-Site Scripting via 'vs_text_submitbtn' Parameter
Summary
The Appointment Booking Calendar plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'vs_text_submitbtn' parameter in all versions up to, and including, 1.4.05 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with subscriber-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This requires the attacker to be assigned as a calendar owner, a per-user grant that any administrator can extend to users as low as Subscriber level through the plugin's calendar list screen. Exploitation by attackers with subscriber-level access and above requires that an administrator has assigned the attacker's account as owner (`conwer`) of a calendar via the plugin's calendar list screen; the plugin's UI lists all registered users regardless of role, so a Subscriber can be assigned. On a default installation, where that is not configured, the vulnerability requires attackers with editor-level access and above.
Severity
6.4 (Medium)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
8 references
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| codepeople | Appointment Booking Calendar |
Affected:
0 , ≤ 1.4.05
(semver)
|
guessed |
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Appointment Booking Calendar",
"vendor": "codepeople",
"versions": [
{
"lessThanOrEqual": "1.4.05",
"status": "affected",
"version": "0",
"versionType": "semver"
}
]
}
],
"credits": [
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"type": "finder",
"value": "Wordfence PRISM"
}
],
"descriptions": [
{
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"value": "The Appointment Booking Calendar plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the \u0027vs_text_submitbtn\u0027 parameter in all versions up to, and including, 1.4.05 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with subscriber-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This requires the attacker to be assigned as a calendar owner, a per-user grant that any administrator can extend to users as low as Subscriber level through the plugin\u0027s calendar list screen. Exploitation by attackers with subscriber-level access and above requires that an administrator has assigned the attacker\u0027s account as owner (`conwer`) of a calendar via the plugin\u0027s calendar list screen; the plugin\u0027s UI lists all registered users regardless of role, so a Subscriber can be assigned. On a default installation, where that is not configured, the vulnerability requires attackers with editor-level access and above."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 6.4,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N",
"version": "3.1"
}
}
],
"problemTypes": [
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"description": "CWE-79 Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-10-28T03:42:54.736Z",
"orgId": "b15e7b5b-3da4-40ae-a43c-f7aa60e62599",
"shortName": "Wordfence"
},
"references": [
{
"url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/dd0e4753-222a-421f-a830-58f6af055dd8?source=cve"
},
{
"url": "https://plugins.trac.wordpress.org/browser/appointment-booking-calendar/tags/1.4.05/inc/cpabc_scheduler.inc.php#L194"
},
{
"url": "https://plugins.trac.wordpress.org/browser/appointment-booking-calendar/tags/1.4.05/inc/cpabc_apps_go.inc.php#L690"
},
{
"url": "https://plugins.trac.wordpress.org/browser/appointment-booking-calendar/tags/1.4.05/inc/cpabc_apps_go.inc.php#L102"
},
{
"url": "https://plugins.trac.wordpress.org/browser/appointment-booking-calendar/tags/1.4.05/inc/cpabc_apps_go.inc.php#L616"
},
{
"url": "https://plugins.trac.wordpress.org/browser/appointment-booking-calendar/tags/1.4.05/inc/cpabc_apps_on.inc.php#L398"
},
{
"url": "https://plugins.trac.wordpress.org/log/appointment-booking-calendar/"
},
{
"url": "https://plugins.trac.wordpress.org/changeset/3750835/appointment-booking-calendar/trunk/inc/cpabc_scheduler.inc.php"
}
],
"timeline": [
{
"lang": "en",
"time": "2026-10-16T15:04:13.000Z",
"value": "Vendor Notified"
},
{
"lang": "en",
"time": "2026-10-27T15:02:33.000Z",
"value": "Disclosed"
}
],
"title": "Appointment Booking Calendar \u003c= 1.4.05 - Authenticated (Subscriber+) Stored Cross-Site Scripting via \u0027vs_text_submitbtn\u0027 Parameter"
}
},
"cveMetadata": {
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"cveId": "CVE-2026-111727",
"datePublished": "2026-10-28T03:42:54.736Z",
"dateReserved": "2026-10-16T14:49:01.044Z",
"dateUpdated": "2026-10-28T03:42:54.736Z",
"state": "PUBLISHED"
},
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"dataVersion": "5.2",
"vulnerability-lookup:meta": {
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"date": "2026-10-28",
"epss": "0.00206",
"percentile": "0.10566"
},
"nvd": {
"cve": {
"affected": [
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"product": "Appointment Booking Calendar",
"vendor": "codepeople",
"versions": [
{
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"status": "affected",
"version": "0",
"versionType": "semver"
}
]
}
],
"source": "security@wordfence.com"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "The Appointment Booking Calendar plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the \u0027vs_text_submitbtn\u0027 parameter in all versions up to, and including, 1.4.05 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with subscriber-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This requires the attacker to be assigned as a calendar owner, a per-user grant that any administrator can extend to users as low as Subscriber level through the plugin\u0027s calendar list screen. Exploitation by attackers with subscriber-level access and above requires that an administrator has assigned the attacker\u0027s account as owner (`conwer`) of a calendar via the plugin\u0027s calendar list screen; the plugin\u0027s UI lists all registered users regardless of role, so a Subscriber can be assigned. On a default installation, where that is not configured, the vulnerability requires attackers with editor-level access and above."
}
],
"id": "CVE-2026-111727",
"lastModified": "2026-10-28T13:46:33.207",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 6.4,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "LOW",
"integrityImpact": "LOW",
"privilegesRequired": "LOW",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N",
"version": "3.1"
},
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"source": "security@wordfence.com",
"type": "Primary"
}
]
},
"published": "2026-10-28T04:17:57.220",
"references": [
{
"source": "security@wordfence.com",
"url": "https://plugins.trac.wordpress.org/browser/appointment-booking-calendar/tags/1.4.05/inc/cpabc_apps_go.inc.php#L102"
},
{
"source": "security@wordfence.com",
"url": "https://plugins.trac.wordpress.org/browser/appointment-booking-calendar/tags/1.4.05/inc/cpabc_apps_go.inc.php#L616"
},
{
"source": "security@wordfence.com",
"url": "https://plugins.trac.wordpress.org/browser/appointment-booking-calendar/tags/1.4.05/inc/cpabc_apps_go.inc.php#L690"
},
{
"source": "security@wordfence.com",
"url": "https://plugins.trac.wordpress.org/browser/appointment-booking-calendar/tags/1.4.05/inc/cpabc_apps_on.inc.php#L398"
},
{
"source": "security@wordfence.com",
"url": "https://plugins.trac.wordpress.org/browser/appointment-booking-calendar/tags/1.4.05/inc/cpabc_scheduler.inc.php#L194"
},
{
"source": "security@wordfence.com",
"url": "https://plugins.trac.wordpress.org/changeset/3750835/appointment-booking-calendar/trunk/inc/cpabc_scheduler.inc.php"
},
{
"source": "security@wordfence.com",
"url": "https://plugins.trac.wordpress.org/log/appointment-booking-calendar/"
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"url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/dd0e4753-222a-421f-a830-58f6af055dd8?source=cve"
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"type": "Primary"
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}
}
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