CVE Explorer
CVE-2026-49210
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
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"product":"ux","vendor":"symfony","versions":[{"status":"affected","version":">= 3.0.0, < 3.1.0"},{"status":"affected","version":">= 2.8.0, < 2.36.0"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:a25442f425edfda0686d695bd6a7d338988ccdc359752d1327a14296339482fd · sha256:3027766d0f6e53d5… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":2.3,"baseSeverity":"LOW","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"LOW","subIntegrityImpact":"LOW","userInteraction":"PASSIVE","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","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE"},"metric_type":"cvssV4_0"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:a25442f425edfda0686d695bd6a7d338988ccdc359752d1327a14296339482fd · sha256:3027766d0f6e53d5… · /containers/cna/metrics/0/cvssV4_0
CWE assertions
1 source assertion{"cweId":"CWE-79","description":"CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:a25442f425edfda0686d695bd6a7d338988ccdc359752d1327a14296339482fd · sha256:3027766d0f6e53d5… · /containers/cna/problemTypes/0/descriptions/0
Source references
4 source assertions{"name":"https://github.com/symfony/ux/commit/fbc5e9a1bda7e4556be21bb1d970f382760ed9a9","tags":["x_refsource_MISC"],"url":"https://github.com/symfony/ux/commit/fbc5e9a1bda7e4556be21bb1d970f382760ed9a9"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:a25442f425edfda0686d695bd6a7d338988ccdc359752d1327a14296339482fd · sha256:3027766d0f6e53d5… · /containers/cna/references/1
{"name":"https://github.com/symfony/ux/releases/tag/v2.36.0","tags":["x_refsource_MISC"],"url":"https://github.com/symfony/ux/releases/tag/v2.36.0"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:a25442f425edfda0686d695bd6a7d338988ccdc359752d1327a14296339482fd · sha256:3027766d0f6e53d5… · /containers/cna/references/2
{"name":"https://github.com/symfony/ux/releases/tag/v3.1.0","tags":["x_refsource_MISC"],"url":"https://github.com/symfony/ux/releases/tag/v3.1.0"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:a25442f425edfda0686d695bd6a7d338988ccdc359752d1327a14296339482fd · sha256:3027766d0f6e53d5… · /containers/cna/references/3
{"name":"https://github.com/symfony/ux/security/advisories/GHSA-38x5-rcv4-xf7x","tags":["x_refsource_CONFIRM"],"url":"https://github.com/symfony/ux/security/advisories/GHSA-38x5-rcv4-xf7x"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:a25442f425edfda0686d695bd6a7d338988ccdc359752d1327a14296339482fd · sha256:3027766d0f6e53d5… · /containers/cna/references/0
Attribution and limitations
- CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →
Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.