Easy!Appointments has server-side request forgery in CalDAV connection test that exposes the deployment's internal network

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Summary

CVECVE-2026-52840
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-14 16:17:00 UTC
Updated2026-07-15 14:18:23 UTC
DescriptionEasy!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.

Risk And Classification

Primary CVSS: v3.1 2.7 LOW from [email protected]

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N

EPSS: 0.001860000 probability, percentile 0.083670000 (date 2026-07-15)

Problem Types: CWE-918 | CWE-918 CWE-918: Server-Side Request Forgery (SSRF)

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary2.7LOWCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N
3.1CNADECLARED2.7LOWCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Alextselegidis Easyappointments affected < 1.6.0 Not specified

References

ReferenceSourceLinkTags
github.com/alextselegidis/easyappointments/commit/6eb9336a91cfb276379506... [email protected] github.com
github.com/alextselegidis/easyappointments/security/advisories/GHSA-pm5p... 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
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