Appointment Booking Calendar <= 1.4.05 - Authenticated (Subscriber+) Stored Cross-Site Scripting via 'vs_text_submitbtn' Parameter
CVSS score
6.4
EPSS probability
—
Risk score
0.6
Published
3 h ago
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Vulnerability description
DayBreach AI Explanation
Verified against sourcesSources read
1
Source agreement
Tam uyum
Evidence confidence
%55
Short explanation
All versions of the Appointment Booking Calendar plugin up to 1.4.05 are vulnerable to stored cross‑site scripting via the 'vs_text_submitbtn' parameter due to insufficient input sanitisation. Authenticated attackers with Subscriber‑level or higher can inject scripts when assigned as calendar owner. The flaw affects every affected version; no official patch has been confirmed (S0, S1).
Stored XSS enables execution of malicious code in victims' browsers, leading to session hijacking and data leakage, especially on calendar sites serving many users.
What should be done?
- Upgrade the plugin to a version that fixes the issue (if available)
- If no fix exists, remove or restrict the plugin’s use
- Limit calendar‑owner assignments to trusted accounts only
- Implement input validation and output escaping for 'vs_text_submitbtn'
- Enable monitoring and logging for suspicious script injections
Chain of evidence and sources
Bu açık, kimliği doğrulanmış (Subscriber+) saldırganların 'vs_text_submitbtn' parametresi üzerinden saklı XSS enjekte etmesine izin verir (S0, S1).
Saldırının gerçekleşebilmesi için saldırganın takvim sahibi olarak atanması gerekir; bu atama, bir yönetici tarafından herhangi bir kullanıcıya, aboneler dahil, verilebilir (S0, S1).
Resmi kaynaklarda yama durumu doğrulanamadığından, yama durumu bilinmiyor; kuruluşlar vendor advisory'yi izlemeli ve gerekirse mitigasyon önlemleri almalıdır (S0).
Show the technical text from the sources
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.
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
CWE: CWE-79
This explanation was compiled automatically from the source records. Scores, active exploitation, patch and exploit status come straight from the sources.
IMPACT: Affected Products and Software
Affected Products
The following products are affected by CVE-2026-111727 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.
| ID | VENDOR | PRODUCT | ACTION |
|---|---|---|---|
| 1 | codepeople | Appointment Booking Calendar | View |
RED HAT CSAF/VEX: Product Impact Check
SCORING: CVSS from Multiple Sources
CVSS Scores
The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.
| SCORE | VERSION | SEVERITY | VECTOR | SOURCE |
|---|---|---|---|---|
| 6.4 | CVSS V31 | MEDIUM | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N | NVD |
| 6.4 | CVSS V3_1 | MEDIUM | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N | CVE CNA |
Patch and Remediation Guide
Solution & Remediation Advisory
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Public exploit and active exploitation status
Verified exploit intelligence
No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.
Weakness Classification and Attack Patterns (CWE & CAPEC)
CWE - Common Weakness Enumeration
While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-111727 is associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-111727 weaknesses.
Attack Vector and Accessibility
Official Sources and Advisories
CVSS Vector Radar Chart
6.4 / 10Vulnerability Scoring Details
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:NYama durumu bilinmiyor
Weakness Type (CWE & CAPEC)
Similar Vulnerabilities
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