CVE-2026-49208
Medium
Description
Symfony UX is a JavaScript ecosystem for Symfony. From 2.8.0 until 2.36.0 and 3.1.0, when a #[LiveProp] is typed as DateTimeInterface and no explicit format is configured, Symfony\UX\LiveComponent\LiveComponentHydrator::hydrateObjectValue() falls back to new $className($value), allowing client-supplied relative strings such as now, tomorrow, or +10 years to move a writable, format-less date prop past time-based business logic checks. This issue is fixed in versions 2.36.0 and 3.1.0.
SeverityMedium
CVSS5.3
Exploit probability—
Product
Symfony Ux
PublishedJul 17, 2026
First seenJul 17, 2026
Weakness typeCWE-20Improper input validation
How to fix
Update
- symfony ux2.36.0 or later
- symfony/ux-live-component2.36.0, 3.1.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| symfony ux | 2.8.0 ≤ v < 2.36.0, 3.0.0 | 2.36.0 |
| symfony/ux-live-componentPackagist | 2.8.0 ≤ v < 2.36.0, 3.0.0 ≤ v < 3.1.0 | 2.36.0, 3.1.0 |
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