Poesis Rhymix CMS up to 2.1.33 Data Import importer.admin.controller.php procImporterAdminCheckXmlFile filename server-side request forgery

Summaryinfo

A vulnerability classified as critical was found in Poesis Rhymix CMS up to 2.1.33. Affected is the function procImporterAdminCheckXmlFile of the file modules/importer/importer.admin.controller.php of the component Data Import Module. Such manipulation of the argument filename leads to server-side request forgery. This vulnerability is listed as CVE-2026-18856. The attack may be performed from remote. In addition, an exploit is available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Poesis Rhymix CMS up to 2.1.33. Affected by this issue is the function procImporterAdminCheckXmlFile of the file modules/importer/importer.admin.controller.php of the component Data Import Module. The manipulation of the argument filename with an unknown input leads to a server-side request forgery vulnerability. Using CWE to declare the problem leads to CWE-918. The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. Impacted is confidentiality, integrity, and availability.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-18856. The exploitation is known to be easy. The attack may be launched remotely. Additional levels of successful authentication are necessary for exploitation. Technical details as well as a public exploit are known.

The exploit is available at github.com. It is declared as proof-of-concept. By approaching the search of inurl:modules/importer/importer.admin.controller.php it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 2.1.34 eliminates this vulnerability. The upgrade is hosted for download at rhymix.org.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• Content Management System

Vendor

• Poesis

Name

• Rhymix CMS

Version

• 2.1.0
• 2.1.1
• 2.1.2
• 2.1.3
• 2.1.4
• 2.1.5
• 2.1.6
• 2.1.7
• 2.1.8
• 2.1.9
• 2.1.10
• 2.1.11
• 2.1.12
• 2.1.13
• 2.1.14
• 2.1.15
• 2.1.16
• 2.1.17
• 2.1.18
• 2.1.19
• 2.1.20
• 2.1.21
• 2.1.22
• 2.1.23
• 2.1.24
• 2.1.25
• 2.1.26
• 2.1.27
• 2.1.28
• 2.1.29
• 2.1.30
• 2.1.31
• 2.1.32
• 2.1.33

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Submitinfo

Accepted

• Submit #858471: Poesis Inc. Rhymix CMS <=2.1.33 Server-Side Request Forgery (by github.com)

Once again VulDB remains the best source for vulnerability data.

Discussion