TI-2026-15434 Aliases CVE-2026-18856 GHSA-26jj-c4g2-h8m6

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

MEDIUM 56CWE-918Published 2026-08-05 · Updated 2026-08-05

Key facts

Attack vector: Network
Privileges required: High
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: —
Confidentiality · integrity · availability: Low · Low · Low
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

A vulnerability was determined in Poesis Rhymix CMS up to 2.1.33. This impacts the function procImporterAdminCheckXmlFile of the file modules/importer/importer.admin.controller.php of the component Data Import Module. This manipulation of the argument filename causes server-side request forgery. The attack is possible to be carried out remotely. The exploit has been publicly disclosed and may be utilized. Upgrading to version 2.1.34 will fix this issue. It is recommended to upgrade the affected component.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00396 34th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by the CNA

Fix Fixed Rhymix CMS (Poesis): 2.1.34

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Poesis	Rhymix CMS	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	2.1.34	Patch available	CNA

Rhymix CMS VendorPoesis Affected 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 Fixed in 2.1.34 Patch available CNA

CPE names CNA · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:poesis:rhymix_cms::::::::	—	—	Poesis

cpe:2.3:a:poesis:rhymix_cms:*:*:*:*:*:*:*:* Versions — — ·Poesis

Remediation

Fix · CNA Rhymix CMS (Poesis) Fixed in 2.1.34

Timeline

2026-10-02 Threatist record created from CVE-2026-18856
2026-10-03 Alias added: GHSA-26jj-c4g2-h8m6

References

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences