{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-40477", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-04-13T19:50:42.113Z", "datePublished": "2026-04-17T21:53:47.271Z", "dateUpdated": "2026-07-15T01:00:53.278Z" }, "containers": { "cna": { "title": "Improper restriction of the scope of accessible objects in Thymeleaf expressions", "problemTypes": [ { "descriptions": [ { "cweId": "CWE-917", "lang": "en", "description": "CWE-917: Improper Neutralization of Special Elements used in an Expression Language Statement ('Expression Language Injection')", "type": "CWE" } ] }, { "descriptions": [ { "cweId": "CWE-1336", "lang": "en", "description": "CWE-1336: Improper Neutralization of Special Elements Used in a Template Engine", "type": "CWE" } ] } ], "metrics": [ { "cvssV3_1": { "attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.1, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H", "version": "3.1" } } ], "references": [ { "name": "https://github.com/thymeleaf/thymeleaf/security/advisories/GHSA-r4v4-5mwr-2fwr", "tags": [ "x_refsource_CONFIRM" ], "url": "https://github.com/thymeleaf/thymeleaf/security/advisories/GHSA-r4v4-5mwr-2fwr" } ], "affected": [ { "vendor": "thymeleaf", "product": "thymeleaf", "versions": [ { "version": "< 3.1.4.RELEASE", "status": "affected" } ] }, { "vendor": "thymeleaf", "product": "org.thymeleaf:thymeleaf-spring5", "versions": [ { "version": "< 3.1.4.RELEASE", "status": "affected" } ] }, { "vendor": "thymeleaf", "product": "org.thymeleaf:thymeleaf-spring6", "versions": [ { "version": "< 3.1.4.RELEASE", "status": "affected" } ] } ], "providerMetadata": { "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-04-17T21:53:47.271Z" }, "descriptions": [ { "lang": "en", "value": "Thymeleaf is a server-side Java template engine for web and standalone environments. Versions 3.1.3.RELEASE and prior contain a security bypass vulnerability in the expression execution mechanisms. Although the library provides mechanisms to prevent expression injection, it fails to properly restrict the scope of accessible objects, allowing specific potentially sensitive objects to be reached from within a template. If an application developer passes unvalidated user input directly to the template engine, an unauthenticated remote attacker can bypass the library's protections to achieve Server-Side Template Injection (SSTI). This issue has ben fixed in version 3.1.4.RELEASE." } ], "source": { "advisory": "GHSA-r4v4-5mwr-2fwr", "discovery": "UNKNOWN" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "timestamp": "2026-04-21T00:00:00+00:00", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "total" } ], "role": "CISA Coordinator", "version": "2.0.3", "id": "CVE-2026-40477" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-04-22T03:55:41.093Z" } }, { "affected": [ { "collectionURL": "https://catalog.redhat.com/software/containers/", "cpes": [ "cpe:/a:redhat:openshift_devspaces:3.28::el9" ], "defaultStatus": "affected", "packageName": "devspaces/openvsx-rhel9", "product": "Red Hat OpenShift Dev Spaces 3.28", "vendor": "Red Hat", "versions": [ { "lessThan": "*", "status": "unaffected", "version": "1779528224", "versionType": "rpm" } ] }, { "collectionURL": "https://catalog.redhat.com/software/containers/", "cpes": [ "cpe:/a:redhat:openshift_devspaces:3.28::el9" ], "defaultStatus": "affected", "packageName": "devspaces/pluginregistry-rhel9", "product": "Red Hat OpenShift Dev Spaces 3.28", "vendor": "Red Hat", "versions": [ { "lessThan": "*", "status": "unaffected", "version": "1779359423", "versionType": "rpm" } ] }, { "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": [ "cpe:/a:redhat:camel_spring_boot:4" ], "defaultStatus": "unaffected", "packageName": "camel-thymeleaf", "product": "Red Hat build of Apache Camel for Spring Boot 4", "vendor": "Red Hat" }, { "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": [ "cpe:/a:redhat:camel_spring_boot:4" ], "defaultStatus": "unaffected", "packageName": "thymeleaf", "product": "Red Hat build of Apache Camel for Spring Boot 4", "vendor": "Red Hat" }, { "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": [ "cpe:/a:redhat:jboss_fuse:7" ], "defaultStatus": "affected", "packageName": "thymeleaf", "product": "Red Hat Fuse 7", "vendor": "Red Hat" }, { "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": [ "cpe:/a:redhat:jboss_enterprise_application_platform:7" ], "defaultStatus": "unaffected", "packageName": "smallrye-mutiny-vertx-web-templ-thymeleaf", "product": "Red Hat JBoss Enterprise Application Platform 7", "vendor": "Red Hat" }, { "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": [ "cpe:/a:redhat:jboss_enterprise_application_platform:7" ], "defaultStatus": "unaffected", "packageName": "thymeleaf", "product": "Red Hat JBoss Enterprise Application Platform 7", "vendor": "Red Hat" }, { "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": [ "cpe:/a:redhat:jboss_enterprise_application_platform:7" ], "defaultStatus": "unaffected", "packageName": "vertx-web-templ-thymeleaf", "product": "Red Hat JBoss Enterprise Application Platform 7", "vendor": "Red Hat" }, { "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": [ "cpe:/a:redhat:jboss_enterprise_application_platform:8" ], "defaultStatus": "unaffected", "packageName": "smallrye-mutiny-vertx-web-templ-thymeleaf", "product": "Red Hat JBoss Enterprise Application Platform 8", "vendor": "Red Hat" }, { "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": [ "cpe:/a:redhat:jboss_enterprise_application_platform:8" ], "defaultStatus": "unaffected", "packageName": "thymeleaf", "product": "Red Hat JBoss Enterprise Application Platform 8", "vendor": "Red Hat" }, { "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": [ "cpe:/a:redhat:jboss_enterprise_application_platform:8" ], "defaultStatus": "unaffected", "packageName": "vertx-web-templ-thymeleaf", "product": "Red Hat JBoss Enterprise Application Platform 8", "vendor": "Red Hat" }, { "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": [ "cpe:/a:redhat:jbosseapxp" ], "defaultStatus": "unaffected", "packageName": "smallrye-mutiny-vertx-web-templ-thymeleaf", "product": "Red Hat JBoss Enterprise Application Platform Expansion Pack", "vendor": "Red Hat" }, { "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": [ "cpe:/a:redhat:jbosseapxp" ], "defaultStatus": "unaffected", "packageName": "spring-boot-starter-thymeleaf", "product": "Red Hat JBoss Enterprise Application Platform Expansion Pack", "vendor": "Red Hat" }, { "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": [ "cpe:/a:redhat:jbosseapxp" ], "defaultStatus": "unaffected", "packageName": "thymeleaf", "product": "Red Hat JBoss Enterprise Application Platform Expansion Pack", "vendor": "Red Hat" }, { "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": [ "cpe:/a:redhat:jbosseapxp" ], "defaultStatus": "unaffected", "packageName": "thymeleaf-extras-java8time", "product": "Red Hat JBoss Enterprise Application Platform Expansion Pack", "vendor": "Red Hat" }, { "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": [ "cpe:/a:redhat:jbosseapxp" ], "defaultStatus": "unaffected", "packageName": "thymeleaf-spring5", "product": "Red Hat JBoss Enterprise Application Platform Expansion Pack", "vendor": "Red Hat" }, { "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": [ "cpe:/a:redhat:jbosseapxp" ], "defaultStatus": "unaffected", "packageName": "vertx-web-templ-thymeleaf", "product": "Red Hat JBoss Enterprise Application Platform Expansion Pack", "vendor": "Red Hat" }, { "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": [ "cpe:/a:redhat:red_hat_single_sign_on:7" ], "defaultStatus": "affected", "packageName": "spring-boot-starter-thymeleaf", "product": "Red Hat Single Sign-On 7", "vendor": "Red Hat" }, { "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": [ "cpe:/a:redhat:red_hat_single_sign_on:7" ], "defaultStatus": "affected", "packageName": "thymeleaf", "product": "Red Hat Single Sign-On 7", "vendor": "Red Hat" }, { "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": [ "cpe:/a:redhat:red_hat_single_sign_on:7" ], "defaultStatus": "affected", "packageName": "thymeleaf-extras-java8time", "product": "Red Hat Single Sign-On 7", "vendor": "Red Hat" }, { "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": [ "cpe:/a:redhat:red_hat_single_sign_on:7" ], "defaultStatus": "affected", "packageName": "thymeleaf-spring5", "product": "Red Hat Single Sign-On 7", "vendor": "Red Hat" } ], "datePublic": "2026-04-17T21:53:47.271Z", "descriptions": [ { "lang": "en", "value": "A flaw was found in Thymeleaf, a server-side Java template engine. An unauthenticated remote attacker can exploit a security bypass vulnerability in the expression execution mechanisms. By providing unvalidated user input directly to the template engine, the attacker can bypass the library's protections, leading to Server-Side Template Injection (SSTI). This allows access to potentially sensitive objects from within a template." } ], "metrics": [ { "other": { "content": { "namespace": "https://access.redhat.com/security/updates/classification/", "value": "Important" }, "type": "Red Hat severity rating" } }, { "cvssV3_1": { "attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.5, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H", "version": "3.1" }, "format": "CVSS" } ], "problemTypes": [ { "descriptions": [ { "cweId": "CWE-917", "description": "Improper Neutralization of Special Elements used in an Expression Language Statement ('Expression Language Injection')", "lang": "en", "type": "CWE" } ] } ], "references": [ { "tags": [ "vdb-entry", "x_refsource_REDHAT" ], "url": "https://access.redhat.com/security/cve/CVE-2026-40477" }, { "name": "RHBZ#2459344", "tags": [ "issue-tracking", "x_refsource_REDHAT" ], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2459344" }, { "tags": [ "x_sadp-csaf-vex" ], "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-40477.json" }, { "tags": [ "vendor-advisory", "x_refsource_REDHAT" ], "url": "https://access.redhat.com/errata/RHSA-2026:21772" } ], "solutions": [ { "lang": "en", "value": "RHSA-2026:21772: Red Hat OpenShift Dev Spaces 3.28" } ], "timeline": [ { "lang": "en", "time": "2026-04-17T23:00:52.793Z", "value": "Reported to Red Hat." }, { "lang": "en", "time": "2026-04-17T21:53:47.271Z", "value": "Made public." } ], "title": "thymeleaf: Thymeleaf: Server-Side Template Injection via security bypass in expression execution", "workarounds": [ { "lang": "en", "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." } ], "x_adpType": "supplier", "x_generator": { "engine": "sadp-cli 1.0.0" }, "providerMetadata": { "orgId": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "shortName": "redhat-SADP", "dateUpdated": "2026-07-15T01:00:53.278Z" } } ] } }