CVE-2026-111727 json
Appointment Booking Calendar <= 1.4.05 - Authenticated (Subscriber+) Stored Cross-Site Scripting via 'vs_text_submitbtn' Parameter
published 12d ago modified 12d ago also EUVD-2026-111577
- cvss
- 6.4
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 10%
- public exploits
- 0
- none known
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.
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Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 12d ago
Exploit prediction
0.21% chance of exploitation in the next 30 days, higher than 10% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N |
Affected products
- codepeople Appointment Booking Calendar
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
- Technology feeds
References
- wordfence.com /threat-intel/vulnerabilities/id/dd0e4753-222a-421f-a830-58f6af055dd8?source=cve
- plugins.trac.wordpress.org /browser/appointment-booking-calendar/tags/1.4.05/inc/cpabc_scheduler.inc.php#L194
- plugins.trac.wordpress.org /browser/appointment-booking-calendar/tags/1.4.05/inc/cpabc_apps_go.inc.php#L690
- plugins.trac.wordpress.org /browser/appointment-booking-calendar/tags/1.4.05/inc/cpabc_apps_go.inc.php#L102
- plugins.trac.wordpress.org /browser/appointment-booking-calendar/tags/1.4.05/inc/cpabc_apps_go.inc.php#L616
- plugins.trac.wordpress.org /browser/appointment-booking-calendar/tags/1.4.05/inc/cpabc_apps_on.inc.php#L398
- plugins.trac.wordpress.org /log/appointment-booking-calendar/
- plugins.trac.wordpress.org /changeset/3750835/appointment-booking-calendar/trunk/inc/cpabc_scheduler.inc.php
Sources
- CVE List CVE-2026-111727
- NVD CVE-2026-111727
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