EUVD-2026-43722Severity by source
AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N
PR:H reflects mandatory backend authentication; C:L reflects partial ~120-byte semi-blind response leakage; no integrity or availability impact applies.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N
Lifecycle Timeline
3DescriptionCVE.org
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.
AnalysisAI
Server-side request forgery in Easy!Appointments prior to 1.6.0 allows authenticated backend users - admins, providers, or secretaries - to probe internal network hosts by supplying arbitrary URLs to the CalDAV synchronization endpoint. The Guzzle HTTP client in Caldav.php:60 forwards a REPORT request to the caller-supplied caldav_url without validating the scheme or destination host, enabling access to loopback, RFC1918, and link-local addresses on the deployment network. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an active, authenticated backend account with admin, provider, or secretary role in Easy!Appointments - unauthenticated attackers cannot reach the vulnerable endpoint. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 score of 2.7 (Low) with vector AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N accurately reflects constrained real-world risk. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | A malicious secretary with a valid Easy!Appointments backend account navigates to the CalDAV settings page and submits a crafted `caldav_url` such as `http://169.254.169.254/latest/meta-data/` or `http://192.168.1.1:8500/v1/agent/members`. The application server dispatches a Guzzle REPORT request to the target, and the exception handler returns the upstream HTTP status code along with approximately 120 bytes of the response body in the JSON error message, revealing the presence and partial content of internal services. … |
| Remediation | Upgrade Easy!Appointments to version 1.6.0, which introduces SSRF host validation directly within the `Caldav_sync` library with validation enabled by default. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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