Answer in brief
CVE-2026-18856 records a Medium severity (CVSS 4.7) vulnerability in Poesis Rhymix CMS Data Import importer.admin.controller.php procImporterAdminCheckXmlFile server-side request forgery. The current sources do not mark it as known exploited. The current feed maps Poesis/Rhymix CMS (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 4.7. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Poesis/Rhymix CMS (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Poesis/Rhymix CMSgeneric | 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 | Not reported |
Published upstream
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2026-18856 records a Medium severity (CVSS 4.7) vulnerability in Poesis Rhymix CMS Data Import importer.admin.controller.php procImporterAdminCheckXmlFile server-side request forgery. The current sources do not mark it as known exploited. The current feed maps Poesis/Rhymix CMS (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 4.7. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Poesis/Rhymix CMS (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Poesis/Rhymix CMSgeneric | 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 | Not reported |
Published upstream
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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.
Quoted source text, attributed separately from HOL analysis.