Cross-Site Scripting (XSS) in alextselegidis/easyappointments (CVE-2026-52838)
Summary
Cross-site scripting in alextselegidis/easyappointments (CVE-2026-52838). Risk of unauthorized operations or information disclosure. Exploitable via POST /index.php/booking_settings/save.
Original description
The description as published by the source.
Easy!Appointments is a self hosted appointment scheduler. Versions prior to 1.6.0 allow administrators to define a custom "booking disabled" message through the booking settings page. That value is stored in the disable_booking_message setting via a rich-text editor and later passed directly to the public booking_message view without escaping or sanitization. An authenticated administrator can store HTML or JavaScript in this field, enable disabled-booking mode, and trigger stored XSS in every unauthenticated visitor who opens the public booking page. Version 1.6.0 fixes the issue.
Source: NIST National Vulnerability Database NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-52838 has been found in alextselegidis/easyappointments.
Attackers can target a specific entry point like POST /index.php/booking_settings/save over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: 2.6/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "alextselegidis/easyappointments CVE-2026-52838" on the vendor's site.
CVE-2026-52838 (alextselegidis/easyappointments) — CWE-79 / CVSS v3 2.6
Attack vector: remote (network-reachable)
Attack surface: POST /index.php/booking_settings/save / disable_booking_message / booking_message
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
Cross-site scripting (XSS) (CWE-79) exists in alextselegidis/easyappointments. Attackers reach the vulnerable code path via POST /index.php/booking_settings/save.
Check the vendor advisory for the affected versions of alextselegidis/easyappointments. Attack surface: POST /index.php/booking_settings/save / disable_booking_message / booking_message.
Severity: Low (CVSS 2.6/10). Risk of unauthorized operations or information disclosure.
Update to the patched release per vendor advisory.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual POST /index.php/booking_settings/save requests with malformed payloads or SQL meta-characters. Run grep -r 'alextselegidis/easyappointments' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r 'alextselegidis/easyappointments' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
alextselegidis/easyappointmentsを grep し、稼働しているサービス・バージョンを把握する。 -
2Hunt for indicators of compromise detect
grep 'POST /index.php/booking_settings/save' /var/log/nginx/access.log | grep -E '(unusual_payload|sqli_pattern)'アクセスログで
POST /index.php/booking_settings/saveへの異常なリクエスト (不正な認証ヘッダ・SQLメタ文字)を過去 30〜90日分捜索。WAF/SIEM があれば該当パスのアラート発火履歴を確認。 -
3Post-deployment verification verify
Replay attack against POST /index.php/booking_settings/save on staging to confirm patch closes the vectorパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番では Step 2 と同じログクエリでアラート再発が無いか継続監視。
Affected packages
References
- advisory github.com
- advisory nvd.nist.gov
- advisory github.com
- package github.com
- patch github.com
- web github.com
- web github.com