{"id":"CVE-2026-49210","state":"PUBLISHED","title":"Symfony UX: XSS in symfony/ux-live-component via attacker-controlled child component tag","description":"Symfony UX is a JavaScript ecosystem for Symfony. From 2.8.0 until 2.36.0 and 3.1.0, Symfony\\UX\\LiveComponent\\Util\\ChildComponentPartialRenderer::createHtml() interpolates the client-controlled children[id].tag value from LiveComponentSubscriber and InterceptChildComponentRenderSubscriber directly into HTML as a tag name without escaping or validation, allowing arbitrary HTML, including <script> tags, on any Live Component re-render that contains at least one child component. This issue is fixed in versions 2.36.0 and 3.1.0.","publishedAt":"2026-07-17T16:09:17.850Z","updatedAt":"2026-07-17T16:52:59.836Z","severity":{"score":2.3,"label":"Low","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["symfony ux"],"affected":[{"vendor":"symfony","product":"ux","versions":[{"version":">= 3.0.0, < 3.1.0","status":"affected"},{"version":">= 2.8.0, < 2.36.0","status":"affected"}]}],"references":["https://github.com/symfony/ux/security/advisories/GHSA-38x5-rcv4-xf7x","https://github.com/symfony/ux/commit/fbc5e9a1bda7e4556be21bb1d970f382760ed9a9","https://github.com/symfony/ux/releases/tag/v2.36.0","https://github.com/symfony/ux/releases/tag/v3.1.0"],"weaknesses":["CWE-79"],"ingestedAt":"2026-10-29T20:12:07.131Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/49xxx/CVE-2026-49210.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-49210","state":"PUBLISHED","datePublished":"2026-07-17T16:09:17.850Z","dateUpdated":"2026-07-17T16:52:59.836Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-05-28T03:42:34.340Z"},"containers":{"cna":{"title":"Symfony UX: XSS in symfony/ux-live-component via attacker-controlled child component tag","descriptions":[{"lang":"en","value":"Symfony UX is a JavaScript ecosystem for Symfony. From 2.8.0 until 2.36.0 and 3.1.0, Symfony\\UX\\LiveComponent\\Util\\ChildComponentPartialRenderer::createHtml() interpolates the client-controlled children[id].tag value from LiveComponentSubscriber and InterceptChildComponentRenderSubscriber directly into HTML as a tag name without escaping or validation, allowing arbitrary HTML, including <script> tags, on any Live Component re-render that contains at least one child component. This issue is fixed in versions 2.36.0 and 3.1.0."}],"affected":[{"vendor":"symfony","product":"ux","versions":[{"version":">= 3.0.0, < 3.1.0","status":"affected"},{"version":">= 2.8.0, < 2.36.0","status":"affected"}]}],"references":[{"url":"https://github.com/symfony/ux/security/advisories/GHSA-38x5-rcv4-xf7x","name":"https://github.com/symfony/ux/security/advisories/GHSA-38x5-rcv4-xf7x","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/symfony/ux/commit/fbc5e9a1bda7e4556be21bb1d970f382760ed9a9","name":"https://github.com/symfony/ux/commit/fbc5e9a1bda7e4556be21bb1d970f382760ed9a9","tags":["x_refsource_MISC"]},{"url":"https://github.com/symfony/ux/releases/tag/v2.36.0","name":"https://github.com/symfony/ux/releases/tag/v2.36.0","tags":["x_refsource_MISC"]},{"url":"https://github.com/symfony/ux/releases/tag/v3.1.0","name":"https://github.com/symfony/ux/releases/tag/v3.1.0","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"PRESENT","privilegesRequired":"NONE","userInteraction":"PASSIVE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"LOW","subIntegrityImpact":"LOW","subAvailabilityImpact":"NONE","baseScore":2.3,"baseSeverity":"LOW","vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N","version":"4.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-79","lang":"en","description":"CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-07-17T16:09:59.645Z"},"source":{"advisory":"GHSA-38x5-rcv4-xf7x","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-17T16:52:49.114369Z","id":"CVE-2026-49210","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-07-17T16:52:59.836Z"}}]}}}