CVE-2026-24044

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{"affected": [{"affectedData": [{"product": "ess-helm", "vendor": "element-hq", "versions": [{"status": "affected", "version": "< 25.12.1"}]}, {"product": "matrix-tools", "vendor": "element-hq", "versions": [{"status": "affected", "version": "< 0.5.7"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Element Server Suite Community Edition (ESS Community) deploys a Matrix stack using the provided Helm charts and Kubernetes distribution. The ESS Community Helm Chart secrets initialization hook (using matrix-tools container before 0.5.7) is using an insecure Matrix server key generation method, allowing network attackers to potentially recreate the same key pair, allowing them to impersonate the victim server. The secret is generated by the secrets initialization hook, in the ESS Community Helm Chart values, if both initSecrets.enabled is not set to false and synapse.signingKey is not defined. Given a server key in Matrix authenticates both requests originating from and events constructed on a given server, this potentially impacts confidentiality, integrity and availability of rooms which have a vulnerable server present as a member. The confidentiality of past conversations in end-to-end encrypted rooms is not impacted. The key generation issue was fixed in matrix-tools 0.5.7, released as part of ESS Community Helm Chart 25.12.1."}, {"lang": "es", "value": "Element Server Suite Community Edition (ESS Community) despliega una pila de Matrix utilizando los gr\u00e1ficos Helm proporcionados y la distribuci\u00f3n de Kubernetes. El hook de inicializaci\u00f3n de secretos del gr\u00e1fico Helm de ESS Community (utilizando el contenedor matrix-tools anterior a la versi\u00f3n 0.5.7) est\u00e1 utilizando un m\u00e9todo inseguro de generaci\u00f3n de claves de servidor de Matrix, permitiendo a los atacantes de red recrear potencialmente el mismo par de claves, lo que les permite suplantar al servidor v\u00edctima. El secreto es generado por el hook de inicializaci\u00f3n de secretos, en los valores del gr\u00e1fico Helm de ESS Community, si tanto initSecrets.enabled no est\u00e1 configurado como falso y synapse.signingKey no est\u00e1 definido. Dado que una clave de servidor en Matrix autentica tanto las solicitudes originadas desde como los eventos construidos en un servidor dado, esto impacta potencialmente la confidencialidad, integridad y disponibilidad de las salas que tienen un servidor vulnerable presente como miembro. La confidencialidad de las conversaciones pasadas en salas cifradas de extremo a extremo no se ve afectada. El problema de generaci\u00f3n de claves fue solucionado en matrix-tools 0.5.7, lanzado como parte del gr\u00e1fico Helm de ESS Community 25.12.1."}], "id": "CVE-2026-24044", "lastModified": "2026-06-17T10:22:30.740", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "HIGH", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 9.2, "baseSeverity": "CRITICAL", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/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", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-24044", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-02-12T20:05:42.483919Z", "version": "2.0.3"}}]}, "published": "2026-02-12T20:16:09.237", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/element-hq/ess-helm/blob/main/docs/maintenance.md#fixing-cve-2026-24044elementsec-2025-1670-manually"}, {"source": "security-advisories@github.com", "url": "https://github.com/element-hq/ess-helm/releases/tag/25.12.2"}, {"source": "security-advisories@github.com", "url": "https://github.com/element-hq/ess-helm/security/advisories/GHSA-qwcj-h6m8-vp6q"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-336"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,25.12.1)"}}], "product": "ess-helm", "vendor": "element-hq"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,0.5.7)"}}], "product": "matrix-tools", "vendor": "element-hq"}], "analysis": {"en": {"generated_at": "2026-04-17T20:02:25.008898+00:00", "value": {"mitigation_remediation": ["Upgrade to ESS Community Helm Chart 25.12.1 or later, which incorporates matrix-tools 0.5.7 and corrects the key generation flaw.", "If an upgrade cannot occur immediately, set initSecrets.enabled to false or explicitly define synapse.signingKey in the Helm values to prevent the automatic creation of an insecure key.", "Limit network access to the Kubernetes cluster to trusted sources to reduce the opportunity for attackers to exploit the vulnerable key generation process."], "summary": {"action": "Immediate Patch", "impact": "Impersonation of Matrix Server"}, "threat_synthesis": {"affected_systems": "Element Server Suite Community Edition deploying Matrix via the ESS Community Helm Chart is affected. Versions of the helm chart prior to 25.12.1, which bundle matrix-tools prior to version 0.5.7, generate the key insecurely if initSecrets.enabled is not disabled and synapse.signingKey is not predefined. Stakeholders using matrix-tools prior to 0.5.7 in this context are at risk.", "description_and_impact": "The vulnerability arises from an insecure server key generation method in the ESS Community Helm Chart's secrets initialization hook, allowing network attackers to recreate the same key pair and impersonate the Matrix server. This could enable attackers to generate events and authenticate requests as the server, potentially compromising the confidentiality, integrity, and availability of rooms that include the vulnerable server as a member. The confidentiality of past conversations in end\u2011to\u2011end encrypted rooms is explicitly stated to remain unaffected.", "risk_and_exploitability": "The CVSS score of 9.2 classifies this as a high\u2011severity vulnerability, and the EPSS score of less than 1% indicates a very low but nonzero likelihood of exploitation. The vulnerability is not listed in the CISA KEV catalog. The likely attack vector is a network attacker targeting the Kubernetes environment hosting the ESS Community Helm Chart, exploiting the insecure key generation to impersonate the server. Exploitation requires network reach to the cluster or the ability to influence the initialization process of the secrets hook."}}}}, "created": "2026-02-13T21:29:34.370409+00:00", "updated": "2026-04-17T20:15:26.988490+00:00", "vendors": ["element-hq", "element-hq$PRODUCT$ess-helm", "element-hq$PRODUCT$matrix-tools"]}