SSRF (Server-Side Request Forgery) in alextselegidis/easyappointments (CVE-2026-52840)
Summary
SSRF in alextselegidis/easyappointments (CVE-2026-52840). Risk of unauthorized operations or information disclosure. Exploitable via caldav_url.
Original description
The description as published by the source.
Easy!Appointments is a self hosted appointment scheduler. In versions prior to 1.6.0, Caldav::connect_to_server at application/controllers/Caldav.php:60 hands the request's caldav_url to a Guzzle REPORT call without scheme or host validation. A logged-in backend user (admin, provider, or secretary) reaches loopback, RFC1918, and link-local hosts on the deployment's network. The Guzzle exception path returns the upstream status code plus ~120 bytes of response body in the JSON message field (Caldav.php:74-78), so the SSRF is semi-blind. Version 1.6.0 contains a patch.
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-2026-52840 has been found in alextselegidis/easyappointments.
Attackers can target a specific entry point like caldav_url over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: 2.7/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "alextselegidis/easyappointments CVE-2026-52840" on the vendor's site.
CVE-2026-52840 (alextselegidis/easyappointments) — CWE-918 / CVSS v3 2.7
Attack vector: remote (network-reachable) / no user interaction
Attack surface: caldav_url / REPORT / message / provider_id
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.
SSRF (CWE-918) exists in alextselegidis/easyappointments. Attackers reach the vulnerable code path via caldav_url.
Check the vendor advisory for the affected versions of alextselegidis/easyappointments. Attack surface: caldav_url / REPORT / message / provider_id.
Severity: Low (CVSS 2.7/10). 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
- web github.com
- web github.com
- web github.com