CVE-2026-18856

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.

CVSS v3 4.7 MEDIUM
CVSS v2.0 5.8 MEDIUM

4.7^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 1.2 / Impact : 3.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required HIGH

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact LOW

Scope UNCHANGED

5.8^/10

CVSS v2.0 : MEDIUM

Vector : AV:N/AC:L/Au:M/C:P/I:P/A:P

Exploitability : 6.4 / Impact : 6.4

Access Vector NETWORK

Access Complexity LOW

Authentication MULTIPLE

Confidentiality Impact PARTIAL

Integrity Impact PARTIAL

Availability Impact PARTIAL

References

Link	Resource
https://github.com/MCzhao2006/Rhymix-SSRF-Report
https://rhymix.org/files/attach/releases/rhymix-2.1.34.zip
https://rhymix.org/news/1948042
https://vuldb.com/cve/CVE-2026-18856
https://vuldb.com/submit/858471
https://vuldb.com/vuln/385868
https://vuldb.com/vuln/385868/cti

Configurations

No configuration.

History

No history.

Information

Published : 2026-08-05 01:16

Updated : 2026-08-12 20:59

NVD link : CVE-2026-18856

Mitre link : CVE-2026-18856

CVE.ORG link : CVE-2026-18856

JSON object : View

Products Affected

No product.

CWE

CWE-918

Server-Side Request Forgery (SSRF)

{"id": "CVE-2026-18856", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-18856", "role": "CISA Coordinator", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-08-05T16:19:26.715375Z"}}], "cvssMetricV2": [{"type": "Secondary", "source": "cna@vuldb.com", "cvssData": {"version": "2.0", "baseScore": 5.8, "accessVector": "NETWORK", "vectorString": "AV:N/AC:L/Au:M/C:P/I:P/A:P", "authentication": "MULTIPLE", "integrityImpact": "PARTIAL", "accessComplexity": "LOW", "availabilityImpact": "PARTIAL", "confidentialityImpact": "PARTIAL"}, "acInsufInfo": false, "impactScore": 6.4, "baseSeverity": "MEDIUM", "obtainAllPrivilege": false, "exploitabilityScore": 6.4, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false}], "cvssMetricV31": [{"type": "Secondary", "source": "cna@vuldb.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 4.7, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L", "integrityImpact": "LOW", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "LOW", "privilegesRequired": "HIGH", "confidentialityImpact": "LOW"}, "impactScore": 3.4, "exploitabilityScore": 1.2}], "cvssMetricV40": [{"type": "Secondary", "source": "cna@vuldb.com", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 2.0, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "LOW", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "exploitMaturity": "PROOF_OF_CONCEPT", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "HIGH", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "LOW", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "LOW", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "LOW", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "affected": [{"source": "cna@vuldb.com", "affectedData": [{"cpes": ["cpe:2.3:a:poesis:rhymix_cms:*:*:*:*:*:*:*:*"], "vendor": "Poesis", "modules": ["Data Import Module"], "product": "Rhymix CMS", "versions": [{"status": "affected", "version": "2.1.0"}, {"status": "affected", "version": "2.1.1"}, {"status": "affected", "version": "2.1.2"}, {"status": "affected", "version": "2.1.3"}, {"status": "affected", "version": "2.1.4"}, {"status": "affected", "version": "2.1.5"}, {"status": "affected", "version": "2.1.6"}, {"status": "affected", "version": "2.1.7"}, {"status": "affected", "version": "2.1.8"}, {"status": "affected", "version": "2.1.9"}, {"status": "affected", "version": "2.1.10"}, {"status": "affected", "version": "2.1.11"}, {"status": "affected", "version": "2.1.12"}, {"status": "affected", "version": "2.1.13"}, {"status": "affected", "version": "2.1.14"}, {"status": "affected", "version": "2.1.15"}, {"status": "affected", "version": "2.1.16"}, {"status": "affected", "version": "2.1.17"}, {"status": "affected", "version": "2.1.18"}, {"status": "affected", "version": "2.1.19"}, {"status": "affected", "version": "2.1.20"}, {"status": "affected", "version": "2.1.21"}, {"status": "affected", "version": "2.1.22"}, {"status": "affected", "version": "2.1.23"}, {"status": "affected", "version": "2.1.24"}, {"status": "affected", "version": "2.1.25"}, {"status": "affected", "version": "2.1.26"}, {"status": "affected", "version": "2.1.27"}, {"status": "affected", "version": "2.1.28"}, {"status": "affected", "version": "2.1.29"}, {"status": "affected", "version": "2.1.30"}, {"status": "affected", "version": "2.1.31"}, {"status": "affected", "version": "2.1.32"}, {"status": "affected", "version": "2.1.33"}, {"status": "unaffected", "version": "2.1.34"}]}]}], "published": "2026-08-05T01:16:44.757", "references": [{"url": "https://github.com/MCzhao2006/Rhymix-SSRF-Report", "source": "cna@vuldb.com"}, {"url": "https://rhymix.org/files/attach/releases/rhymix-2.1.34.zip", "source": "cna@vuldb.com"}, {"url": "https://rhymix.org/news/1948042", "source": "cna@vuldb.com"}, {"url": "https://vuldb.com/cve/CVE-2026-18856", "source": "cna@vuldb.com"}, {"url": "https://vuldb.com/submit/858471", "source": "cna@vuldb.com"}, {"url": "https://vuldb.com/vuln/385868", "source": "cna@vuldb.com"}, {"url": "https://vuldb.com/vuln/385868/cti", "source": "cna@vuldb.com"}], "vulnStatus": "Deferred", "weaknesses": [{"type": "Secondary", "source": "cna@vuldb.com", "description": [{"lang": "en", "value": "CWE-918"}]}], "descriptions": [{"lang": "en", "value": "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."}], "lastModified": "2026-08-12T20:59:00.027", "sourceIdentifier": "cna@vuldb.com"}