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{"bugzilla": {"description": "postcss: PostCSS: Cross-Site Scripting (XSS) via improper escaping of style closing tags", "id": "2461366", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2461366"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.1", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "status": "draft"}, "cwe": "CWE-79", "details": ["A flaw was found in PostCSS. This vulnerability allows a remote attacker to perform Cross-Site Scripting (XSS) by submitting specially crafted CSS. When PostCSS processes and re-stringifies this CSS for embedding within HTML `<style>` tags, it fails to properly escape `</style>` sequences. 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{"cpe": "cpe:/a:redhat:jboss_enterprise_application_platform:7", "fix_state": "Fix deferred", "package_name": "postcss", "product_name": "Red Hat JBoss Enterprise Application Platform 7"}, {"cpe": "cpe:/a:redhat:jboss_enterprise_application_platform:8", "fix_state": "Fix deferred", "package_name": "postcss", "product_name": "Red Hat JBoss Enterprise Application Platform 8"}, {"cpe": "cpe:/a:redhat:jbosseapxp", "fix_state": "Fix deferred", "package_name": "postcss", "product_name": "Red Hat JBoss Enterprise Application Platform Expansion Pack"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Fix deferred", "package_name": "rhoai/odh-mlflow-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "openshift3/ose-console", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "openshift4/ose-agent-installer-ui-rhel9", 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"fix_state": "Fix deferred", "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": "Fix deferred", "package_name": "odf4/odf-multicluster-console-rhel9", "product_name": "Red Hat Openshift Data Foundation 4"}, {"cpe": "cpe:/a:redhat:openshift_devspaces:3", "fix_state": "Fix deferred", "package_name": "devspaces/dashboard-rhel9", "product_name": "Red Hat OpenShift Dev Spaces"}, {"cpe": "cpe:/a:redhat:openshift_devspaces:3", "fix_state": "Fix deferred", "package_name": "devspaces/openvsx-rhel9", "product_name": "Red Hat OpenShift Dev Spaces"}, {"cpe": "cpe:/a:redhat:container_native_virtualization:4", "fix_state": "Fix deferred", "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": "Fix deferred", "package_name": "postcss", "product_name": "Red Hat Process Automation 7"}, {"cpe": "cpe:/a:redhat:quay:3", "fix_state": "Fix deferred", "package_name": "quay/quay-rhel8", "product_name": "Red Hat Quay 3"}, {"cpe": "cpe:/a:redhat:quay:3", "fix_state": "Fix deferred", "package_name": "quay/quay-rhel9", "product_name": "Red Hat Quay 3"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Fix deferred", "package_name": "nodejs-css-loader", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Fix deferred", "package_name": "nodejs-sanitize-html", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Fix deferred", "package_name": "satellite/iop-advisor-frontend-rhel9", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Fix deferred", "package_name": "satellite/iop-host-inventory-frontend-rhel9", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Fix deferred", "package_name": "satellite/iop-vulnerability-frontend-rhel9", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:red_hat_single_sign_on:7", "fix_state": "Fix deferred", "package_name": "postcss", "product_name": "Red Hat Single Sign-On 7"}, {"cpe": "cpe:/a:redhat:trusted_artifact_signer:1", "fix_state": "Fix deferred", "package_name": "rhtas/rekor-search-ui-rhel9", "product_name": "Red Hat Trusted Artifact Signer"}, {"cpe": "cpe:/a:redhat:ansible_portal:2", "fix_state": "Fix deferred", "package_name": "ansible-automation-platform/automation-portal", "product_name": "Self-service automation portal 2"}, {"cpe": "cpe:/a:redhat:amq_streams:2", "fix_state": "Fix deferred", "package_name": "postcss", "product_name": "streams for Apache Kafka 2"}, {"cpe": "cpe:/a:redhat:amq_streams:3", "fix_state": "Fix deferred", "package_name": "postcss", "product_name": "streams for Apache Kafka 3"}], "public_date": "2026-04-24T02:27:47Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-41305\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-41305\nhttps://github.com/postcss/postcss/releases/tag/8.5.10\nhttps://github.com/postcss/postcss/security/advisories/GHSA-qx2v-qp2m-jg93"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,8.5.10)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "postcss", "source": "cna", "vendor": "postcss"}, "product": "postcss", "vendor": "postcss"}], "analysis": {"en": {"generated_at": "2026-04-28T14:26:35.260427+00:00", "value": {"mitigation_remediation": ["Upgrade PostCSS to version 8.5.10 or newer.", "Validate or sanitize all user\u2011supplied CSS before parsing and avoid embedding raw CSS into <style> tags.", "If untrusted CSS must be accepted, implement server\u2011side escaping of </style> sequences or use a rendering method that does not rewrite CSS from an AST back into a string."], "summary": {"action": "Patch", "impact": "Cross\u2011Site Scripting"}, "threat_synthesis": {"affected_systems": "The vulnerability affects the PostCSS library (postcss:postcss). All releases prior to 8.5.10 are impacted, as the remediation was introduced in 8.5.10. Systems that parse user CSS with PostCSS and subsequently embed it in page <style> tags are at risk.", "description_and_impact": "PostCSS versions older than 8.5.10 omit escaping the literal sequence </style> when converting an abstract syntax tree back into CSS text. When user\u2011supplied CSS is parsed and then re\u2011stringified for inclusion inside an HTML <style> element, the unescaped sequence ends the style block and allows embedding of arbitrary HTML or JavaScript, thereby creating a classic cross\u2011site scripting flaw. The weakness is a classic input validation failure (CWE\u201179).", "risk_and_exploitability": "The CVSS score of 6.1 places the flaw in the medium severity range. EPSS indicates an exploitation probability of less than 1 percent, and the vulnerability is not listed in the CISA KEV catalog, suggesting limited public exploitation. The likely attack vector is local or remote injection of CSS content that is processed by PostCSS and rendered into a web page; therefore, secure channels that allow arbitrary CSS to be processed by PostCSS and rendered into a web page pose a risk."}}}}, "created": "2026-04-27T19:15:11.632020+00:00", "updated": "2026-04-28T14:30:33.769249+00:00", "vendors": ["postcss", "postcss$PRODUCT$postcss"]}