CVE-2026-41240

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{"affected": [{"affectedData": [{"product": "DOMPurify", "vendor": "cure53", "versions": [{"status": "affected", "version": "< 3.4.0"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:cure53:dompurify:*:*:*:*:*:*:*:*", "matchCriteriaId": "FB517D2F-834A-4C6E-949C-A548549A07B9", "versionEndExcluding": "3.4.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "DOMPurify is a DOM-only cross-site scripting sanitizer for HTML, MathML, and SVG. Versions prior to 3.4.0 have an inconsistency between FORBID_TAGS and FORBID_ATTR handling when function-based ADD_TAGS is used. Commit c361baa added an early exit for FORBID_ATTR at line 1214. The same fix was not applied to FORBID_TAGS. At line 1118-1123, when EXTRA_ELEMENT_HANDLING.tagCheck returns true, the short-circuit evaluation skips the FORBID_TAGS check entirely. This allows forbidden elements to survive sanitization with their attributes intact. Version 3.4.0 patches the issue."}, {"lang": "es", "value": "DOMPurify es un saneador de cross-site scripting solo para DOM para HTML, MathML y SVG. Las versiones anteriores a la 3.4.0 tienen una inconsistencia entre el manejo de FORBID_TAGS y FORBID_ATTR cuando se utiliza ADD_TAGS basado en funciones. El commit c361baa a\u00f1adi\u00f3 una salida temprana para FORBID_ATTR en la l\u00ednea 1214. La misma correcci\u00f3n no se aplic\u00f3 a FORBID_TAGS. En las l\u00edneas 1118-1123, cuando EXTRA_ELEMENT_HANDLING.tagCheck devuelve true, la evaluaci\u00f3n de cortocircuito omite completamente la verificaci\u00f3n de FORBID_TAGS. Esto permite que los elementos prohibidos sobrevivan a la sanitizaci\u00f3n con sus atributos intactos. La versi\u00f3n 3.4.0 corrige el problema."}], "id": "CVE-2026-41240", "lastModified": "2026-10-26T21:10:00.170", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.1, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 2.7, "source": "nvd@nist.gov", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 6.0, "baseSeverity": "MEDIUM", "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": "PASSIVE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:H/VA:N/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": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-41240", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-04-23T17:21:26.630611Z", "version": "2.0.3"}}]}, "published": "2026-04-23T16:16:26.710", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/cure53/DOMPurify/commit/c361baa18dbdcb3344a41110f4c48ad85bf48f80"}, {"source": "security-advisories@github.com", "tags": ["Product", "Release Notes"], "url": "https://github.com/cure53/DOMPurify/releases/tag/3.4.0"}, {"source": "security-advisories@github.com", "tags": ["Exploit", "Mitigation", "Patch", "Vendor Advisory"], "url": "https://github.com/cure53/DOMPurify/security/advisories/GHSA-h7mw-gpvr-xq4m"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Mitigation", "Patch", "Vendor Advisory"], "url": "https://github.com/cure53/DOMPurify/security/advisories/GHSA-h7mw-gpvr-xq4m"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-79"}, {"lang": "en", "value": "CWE-183"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"bugzilla": {"description": "DOMPurify: DOMPurify: Cross-Site Scripting (XSS) via inconsistent tag sanitization", "id": "2461147", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2461147"}, "csaw": false, "cvss3": {"cvss3_base_score": "8.1", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N", "status": "draft"}, "cwe": "CWE-79", "details": ["A flaw was found in DOMPurify, a DOM-only cross-site scripting sanitizer. A remote attacker could exploit an inconsistency in how forbidden tags and attributes are handled when function-based tag additions are used. This allows malicious HTML, MathML, or SVG elements to bypass sanitization and execute arbitrary code in the user's browser, leading to Cross-Site Scripting (XSS)."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability."}, "name": "CVE-2026-41240", "package_state": [{"cpe": "cpe:/a:redhat:cryostat:4", "fix_state": "Affected", "package_name": "cryostat-openshift-console-plugin-npm", "product_name": "Cryostat 4"}, {"cpe": "cpe:/a:redhat:cryostat:4", "fix_state": "Affected", "package_name": "dompurify", "product_name": "Cryostat 4"}, {"cpe": "cpe:/a:redhat:migration_toolkit_virtualization:2", "fix_state": "Not affected", "package_name": "migration-toolkit-virtualization/mtv-console-plugin-rhel9", "product_name": "Migration Toolkit for Virtualization"}, {"cpe": "cpe:/a:redhat:migration_toolkit_virtualization:2", "fix_state": "Affected", "package_name": "mtv-candidate/mtv-console-plugin-rhel9", "product_name": "Migration Toolkit for Virtualization"}, {"cpe": "cpe:/a:redhat:multicluster_engine", "fix_state": "Affected", "package_name": "multicluster-engine/console-mce-rhel9", "product_name": "Multicluster Engine for Kubernetes"}, {"cpe": "cpe:/a:redhat:workload_availability_nhc:0", "fix_state": "Affected", "package_name": "workload-availability/node-healthcheck-must-gather-rhel9", "product_name": "Node HealthCheck Operator"}, {"cpe": "cpe:/a:redhat:workload_availability_nhc:0", "fix_state": "Affected", "package_name": "workload-availability/node-healthcheck-operator-bundle", "product_name": "Node HealthCheck Operator"}, {"cpe": "cpe:/a:redhat:workload_availability_nhc:0", "fix_state": "Affected", "package_name": "workload-availability/node-healthcheck-rhel9-operator", "product_name": "Node HealthCheck Operator"}, {"cpe": 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"cpe:/a:redhat:ansible_automation_platform:2", "fix_state": "Not affected", "package_name": "ansible-automation-platform-26/gateway-rhel9", "product_name": "Red Hat Ansible Automation Platform 2"}, {"cpe": "cpe:/a:redhat:ansible_automation_platform:2", "fix_state": "Not affected", "package_name": "automation-controller", "product_name": "Red Hat Ansible Automation Platform 2"}, {"cpe": "cpe:/a:redhat:ansible_automation_platform:2", "fix_state": "Affected", "package_name": "automation-eda-controller", "product_name": "Red Hat Ansible Automation Platform 2"}, {"cpe": "cpe:/a:redhat:ansible_automation_platform:2", "fix_state": "Affected", "package_name": "automation-gateway", "product_name": "Red Hat Ansible Automation Platform 2"}, {"cpe": "cpe:/a:redhat:ansible_automation_platform:2", "fix_state": "Affected", "package_name": "automation-platform-ui", "product_name": "Red Hat Ansible Automation Platform 2"}, {"cpe": "cpe:/a:redhat:apache_camel_hawtio:4", "fix_state": "Not affected", 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"package_name": "dompurify", "product_name": "Red Hat Data Grid 8"}, {"cpe": "cpe:/a:redhat:rhdh:1", "fix_state": "Affected", "package_name": "rhdh/rhdh-hub-rhel9", "product_name": "Red Hat Developer Hub"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "grafana", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "grafana", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "grafana", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Affected", "package_name": "ruff", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Not affected", "package_name": "rhoai/odh-dashboard-rhel8", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Affected", "package_name": "rhoai/odh-dashboard-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Affected", "package_name": "rhoai/odh-mod-arch-gen-ai-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Not affected", "package_name": "rhoai/odh-mod-arch-maas-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Affected", "package_name": "rhoai/odh-mod-arch-model-registry-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "openshift3/ose-console", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "openshift4/ose-console", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "openshift4/ose-console-rhel9", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "openshift4/ose-monitoring-plugin-rhel9", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift_data_foundation:4", "fix_state": "Affected", "package_name": "odf4/ocs-client-console-rhel9", "product_name": "Red Hat Openshift Data Foundation 4"}, {"cpe": "cpe:/a:redhat:openshift_data_foundation:4", "fix_state": "Affected", "package_name": "odf4/odf-console-rhel8", "product_name": "Red Hat Openshift Data Foundation 4"}, {"cpe": "cpe:/a:redhat:openshift_data_foundation:4", "fix_state": "Affected", "package_name": "odf4/odf-console-rhel9", "product_name": "Red Hat Openshift Data Foundation 4"}, {"cpe": "cpe:/a:redhat:openshift_data_foundation:4", "fix_state": "Affected", "package_name": "odf4/odf-multicluster-console-rhel8", "product_name": "Red Hat Openshift Data Foundation 4"}, {"cpe": "cpe:/a:redhat:openshift_data_foundation:4", "fix_state": "Affected", "package_name": "odf4/odf-multicluster-console-rhel9", "product_name": "Red Hat Openshift Data Foundation 4"}, {"cpe": "cpe:/a:redhat:openshift_devspaces:3", "fix_state": "Affected", "package_name": "devspaces/code-rhel9", "product_name": "Red Hat OpenShift Dev Spaces"}, {"cpe": "cpe:/a:redhat:openshift_devspaces:3", "fix_state": "Affected", "package_name": "devspaces/openvsx-rhel9", "product_name": "Red Hat OpenShift Dev Spaces"}, {"cpe": "cpe:/a:redhat:openshift_gitops:1", "fix_state": "Affected", "package_name": "openshift-gitops-1/argocd-rhel8", "product_name": "Red Hat OpenShift GitOps"}, {"cpe": "cpe:/a:redhat:openshift_gitops:1", "fix_state": "Affected", "package_name": "openshift-gitops-1/argocd-rhel9", "product_name": "Red Hat OpenShift GitOps"}, {"cpe": "cpe:/a:redhat:container_native_virtualization:4", "fix_state": "Affected", "package_name": "container-native-virtualization/kubevirt-console-plugin", "product_name": "Red Hat OpenShift Virtualization 4"}, {"cpe": "cpe:/a:redhat:container_native_virtualization:4", "fix_state": "Affected", "package_name": "container-native-virtualization/kubevirt-console-plugin-rhel9", "product_name": "Red Hat OpenShift Virtualization 4"}, {"cpe": "cpe:/a:redhat:jboss_enterprise_bpms_platform:7", "fix_state": "Not affected", "package_name": "dompurify", "product_name": "Red Hat Process Automation 7"}, {"cpe": "cpe:/a:redhat:ansible_portal:2", "fix_state": "Affected", "package_name": "ansible-automation-platform/automation-portal", "product_name": "Self-service automation portal 2"}, {"cpe": "cpe:/a:redhat:amq_streams:2", "fix_state": "Affected", "package_name": "dompurify", "product_name": "streams for Apache Kafka 2"}, {"cpe": "cpe:/a:redhat:amq_streams:3", "fix_state": "Affected", "package_name": "dompurify", "product_name": "streams for Apache Kafka 3"}], "public_date": "2026-04-23T14:54:32Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-41240\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-41240\nhttps://github.com/cure53/DOMPurify/commit/c361baa18dbdcb3344a41110f4c48ad85bf48f80\nhttps://github.com/cure53/DOMPurify/releases/tag/3.4.0\nhttps://github.com/cure53/DOMPurify/security/advisories/GHSA-h7mw-gpvr-xq4m"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,3.4.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "DOMPurify", "source": "cna", "vendor": "cure53"}, "product": "dompurify", "vendor": "cure53"}], "analysis": {"en": {"generated_at": "2026-04-28T14:51:27.737045+00:00", "value": {"mitigation_remediation": ["Upgrade DOMPurify to version 3.4.0 or later.", "Avoid using function\u2011based ADD_TAGS predicates until the upgrade is applied; replace them with explicit tag lists if necessary.", "Implement a Content Security Policy that restricts inline scripts and disallows unsafeEval to mitigate remaining XSS risk."], "summary": {"action": "Apply Patch", "impact": "Cross\u2011Site Scripting"}, "threat_synthesis": {"affected_systems": "Affected systems include any application that uses the DOMPurify library from cure53 prior to release 3.4.0. This covers all versions older than 3.4.0 that employ function\u2011based add_tags predicates. The issue is fixed in DOMPurify 3.4.0, so users should verify the library version in their codebase and upgrade accordingly.", "description_and_impact": "DOMPurify is a client\u2011side sanitizer that removes unsafe markup from user\u2011supplied content. The vulnerability stems from an inconsistency between the FORBID_TAGS and FORBID_ATTR handling when developers supply a function\u2011based ADD_TAGS predicate. The short\u2011circuit logic in the sanitizer skips the FORBID_TAGS check, letting disallowed elements and their attributes remain in the output. As a result, an attacker can inject forbidden tags that execute scripts or perform other malicious actions, constituting a cross\u2011site scripting issue.", "risk_and_exploitability": "The CVSS score is 6, marking the bug as moderate severity. The EPSS score of fewer than 1% indicates a low likelihood of active exploitation at present. The vulnerability is not listed in the KEV catalog. Exploitation is client\u2011side only, and the attacker would need to supply crafted input that uses a function\u2011based add_tags predicate to bypass the forbidden tags check and inject malicious markup. The resulting XSS could lead to data theft, session hijacking, or defacement. Prompt patching or removal of vulnerable usage patterns reduces the attack surface."}}}}, "created": "2026-04-28T01:45:18.073936+00:00", "updated": "2026-04-28T15:00:14.511473+00:00", "vendors": ["cure53", "cure53$PRODUCT$dompurify"]}