CVE-2026-52840: CWE-918: Server-Side Request Forgery (SSRF) in alextselegidis easyappointments
Easy!Appointments versions prior to 1.6.0 contain a Server-Side Request Forgery (SSRF) vulnerability in the Caldav::connect_to_server function. This function does not validate the scheme or host of the caldav_url parameter before making a Guzzle REPORT request. Authenticated backend users can exploit this to send requests to internal network addresses such as loopback, RFC1918, and link-local hosts. The vulnerability is semi-blind, as some response data is returned in error messages. Version 1.6.0 includes a patch for this issue.
AI Analysis
Technical Summary
The SSRF vulnerability in Easy!Appointments occurs in versions before 1.6.0 within the Caldav::connect_to_server method, where the caldav_url parameter is passed to a Guzzle HTTP client REPORT request without validating the URL's scheme or host. This allows authenticated backend users (admin, provider, or secretary) to make requests to internal network addresses, including loopback and private IP ranges. The error handling path returns the upstream HTTP status code and approximately 120 bytes of the response body in a JSON message field, enabling semi-blind SSRF exploitation. The vulnerability is addressed in version 1.6.0.
Potential Impact
An authenticated backend user can leverage this SSRF vulnerability to send HTTP REPORT requests to internal network resources that are normally inaccessible externally. This could potentially expose internal services or information through error message responses. The CVSS score is low (2.7) with limited confidentiality impact and no integrity or availability impact.
Mitigation Recommendations
Version 1.6.0 of Easy!Appointments contains a patch that fixes this SSRF vulnerability. Users should upgrade to version 1.6.0 or later to remediate this issue. No official vendor advisory or patch link is provided, so verify the upgrade availability from the vendor source. Since this is a self-hosted product, remediation depends on user action to upgrade.
CVE-2026-52840: CWE-918: Server-Side Request Forgery (SSRF) in alextselegidis easyappointments
Description
Easy!Appointments versions prior to 1.6.0 contain a Server-Side Request Forgery (SSRF) vulnerability in the Caldav::connect_to_server function. This function does not validate the scheme or host of the caldav_url parameter before making a Guzzle REPORT request. Authenticated backend users can exploit this to send requests to internal network addresses such as loopback, RFC1918, and link-local hosts. The vulnerability is semi-blind, as some response data is returned in error messages. Version 1.6.0 includes a patch for this issue.
CVSS v3.1
Score 2.7low
Affected software
pkg:github/alextselegidis/easyappointmentsRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The SSRF vulnerability in Easy!Appointments occurs in versions before 1.6.0 within the Caldav::connect_to_server method, where the caldav_url parameter is passed to a Guzzle HTTP client REPORT request without validating the URL's scheme or host. This allows authenticated backend users (admin, provider, or secretary) to make requests to internal network addresses, including loopback and private IP ranges. The error handling path returns the upstream HTTP status code and approximately 120 bytes of the response body in a JSON message field, enabling semi-blind SSRF exploitation. The vulnerability is addressed in version 1.6.0.
Potential Impact
An authenticated backend user can leverage this SSRF vulnerability to send HTTP REPORT requests to internal network resources that are normally inaccessible externally. This could potentially expose internal services or information through error message responses. The CVSS score is low (2.7) with limited confidentiality impact and no integrity or availability impact.
Mitigation Recommendations
Version 1.6.0 of Easy!Appointments contains a patch that fixes this SSRF vulnerability. Users should upgrade to version 1.6.0 or later to remediate this issue. No official vendor advisory or patch link is provided, so verify the upgrade availability from the vendor source. Since this is a self-hosted product, remediation depends on user action to upgrade.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-06-08T18:41:27.724Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a565a3b68715ace43c7b629
Added to database: 07/14/2026, 15:48:11 UTC
Last enriched: 07/14/2026, 16:20:12 UTC
Last updated: 07/14/2026, 16:27:55 UTC
Views: 2
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