CVE-2026-49208CWE-20

Symfony UX: Format-less date LiveProps parsed with the permissive DateTime constructor

Medium · published July 17, 2026

CVSS v4.0
6.9
EPSS
0%
Percentile
34.3
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
6.9 · MEDIUM
Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
EPSS
0.00412 · 34.3th percentile
Weakness
CWE-20 · Improper Input Validation
Published
2026-07-17T16:10Z
EPSS history
Timeline
  • 17 JUL 16:10Z
    Symfony UX: Format-less date LiveProps parsed with the permissive DateTime constructor
    cvelistv5