Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Symfony | Ux | >= 2.8.0, < 2.36.0 |
Related Weaknesses (CWE)
References
- https://github.com/symfony/ux/commit/d24d78fda6df2d5964312255943ebf3a217b79a2Patch
- https://github.com/symfony/ux/releases/tag/v2.36.0Release Notes
- https://github.com/symfony/ux/releases/tag/v3.1.0Release Notes
- https://github.com/symfony/ux/security/advisories/GHSA-89g7-22c8-3j23Vendor Advisory
FAQ
What is CVE-2026-49208?
CVE-2026-49208 is a vulnerability with a CVSS score of 5.3 (MEDIUM). 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\Liv...
How severe is CVE-2026-49208?
CVE-2026-49208 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-49208?
Check the references section above for vendor advisories and patch information. Affected products include: Symfony Ux.