Vulnerability Details CVE-2026-49215
Symfony UX is a JavaScript ecosystem for Symfony. From 2.22.0 until 2.36.0 and 3.1.0, Symfony\UX\LiveComponent\EventListener\LiveComponentSubscriber::isLiveComponentRequest() gates #[LiveAction] invocations on Accept: application/vnd.live-component+html, but the Accept header is CORS-safelisted and cross-origin fetch() can set it without preflight, allowing forged cross-origin #[LiveAction] requests against a victim session when applications use SameSite=None, credentials: 'include', a permissive cookie policy, or a same-origin pivot. This issue is fixed in versions 2.36.0 and 3.1.0.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.002
EPSS Ranking 7.6%
CVSS Severity
CVSS v3 Score 5.4
References
Products affected by CVE-2026-49215
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cpe:2.3:a:symfony:ux:2.22.0
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cpe:2.3:a:symfony:ux:2.22.1
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cpe:2.3:a:symfony:ux:2.23.0
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cpe:2.3:a:symfony:ux:2.24.0
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cpe:2.3:a:symfony:ux:2.25.0
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cpe:2.3:a:symfony:ux:2.25.1
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cpe:2.3:a:symfony:ux:2.25.2
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cpe:2.3:a:symfony:ux:2.26.0
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cpe:2.3:a:symfony:ux:2.26.1
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cpe:2.3:a:symfony:ux:2.27.0
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cpe:2.3:a:symfony:ux:2.28.0
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cpe:2.3:a:symfony:ux:2.28.1
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cpe:2.3:a:symfony:ux:2.28.2
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cpe:2.3:a:symfony:ux:2.29.0
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cpe:2.3:a:symfony:ux:2.29.1
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cpe:2.3:a:symfony:ux:2.29.2
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cpe:2.3:a:symfony:ux:2.30.0
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cpe:2.3:a:symfony:ux:2.31.0
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cpe:2.3:a:symfony:ux:2.32.0
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cpe:2.3:a:symfony:ux:2.33.0
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cpe:2.3:a:symfony:ux:2.34.0
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cpe:2.3:a:symfony:ux:2.35.0
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cpe:2.3:a:symfony:ux:3.0.0