Vulnerability in alextselegidis/easyappointments (CVE-2026-52841)
Summary
Vulnerability in alextselegidis/easyappointments (CVE-2026-52841). Risk of unauthorized operations or information disclosure. Exploitable via provider_id.
Original description
The description as published by the source.
Easy!Appointments is a self hosted appointment scheduler. In versions prior to 1.6.0, Google::oauth at application/controllers/Google.php:278 stores its URL-supplied provider_id in the session, and oauth_callback saves the issued Google OAuth token against that row without checking the caller owns the provider. Any logged-in backend user (admin, provider, or secretary) rebinds a peer provider's Google sync to a Google account they control. The peer's appointments then sync into the attacker's calendar with each customer's name and email attached as attendee data. Version 1.6.0 patches 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-2026-52841 has been found in alextselegidis/easyappointments.
Attackers can target a specific entry point like provider_id over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: 3.1/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "alextselegidis/easyappointments CVE-2026-52841" on the vendor's site.
CVE-2026-52841 (alextselegidis/easyappointments) — CWE-639 / CVSS v3 3.1
Attack vector: remote (network-reachable)
Attack surface: provider_id / oauth_callback / select_google_calendar / disable_provider_sync
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.
A vulnerability (CWE-639) exists in alextselegidis/easyappointments. Attackers reach the vulnerable code path via provider_id.
Check the vendor advisory for the affected versions of alextselegidis/easyappointments. Attack surface: provider_id / oauth_callback / select_google_calendar / disable_provider_sync.
Severity: Low (CVSS 3.1/10). 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 request patterns matching this CVE's known IOCs. 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。 -
2Post-deployment verification verify
Confirm patched version is live in production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。本番ではアクセスログ・WAF 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