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Low, CVSS 2.7amended

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

CVE-2026-52840GHSA-pm5p-7w5h-jm5q

What to do

Vendor response not established. Follow the primary source's mitigation guidance and check back for a fix.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • Packagist alextselegidis/easyappointments

    Affected
    <= 1.5.2
    Fixed in
    no fixed version recorded

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
2.7 · CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N
EPSS
  • CVE-2026-52840: 0.23% estimated exploitation activity in the next 30 days; percentile 14.25 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Summary Caldav::connecttoserver at application/controllers/Caldav.php:60 hands the request's caldavurl 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. Preconditions - Backend login on the target instance. Non-admin attackers supply their own providerid and pass the per-row check at Caldav.php:52; admins can target any row. - Default deployment per the project's own docker-compose.yml, which puts mysql, mailpit, phpmyadmin, baikal, openldap, phpldapadmin, and swagger-ui on the same docker network as php-fpm. Details The per-row check at line 52 only constrains which provider record the caller may write to; it does not constrain where the outbound request lands. $caldavurl flows…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 2 · amended ·

    Amended from ghsa record GHSA-pm5p-7w5h-jm5q

  2. Revision 1 · created ·

    Published from osv record GHSA-pm5p-7w5h-jm5q

Agent brief

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# Patch Next advisory brief: CVE-2026-52840

Advisory: Easy!Appointments has server-side request forgery in CalDAV connection test that exposes the deployment's internal network
IDs: CVE-2026-52840, GHSA-pm5p-7w5h-jm5q
Record: https://patchnext.com/advisories/cve-2026-52840 (revision 2, source checked 26 Oct 2026, 14:50 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Low (CVSS 2.7)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor response not established. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist alextselegidis/easyappointments: affected <= 1.5.2

## Suggested inspection (read-only)
- Packagist alextselegidis/easyappointments: check the installed version with your package manager.

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on alextselegidis/easyappointments.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-pm5p-7w5h-jm5q (OSV record GHSA-pm5p-7w5h-jm5q lists affected ranges: Packagist alextselegidis/easyappointments >=0 <=1.5.2)
- Verified: https://github.com/advisories/GHSA-pm5p-7w5h-jm5q (GitHub-reviewed advisory GHSA-pm5p-7w5h-jm5q lists affected ranges: Packagist alextselegidis/easyappointments >=0 <=1.5.2)

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