Medium severity · published Jul 17, 2026
CVE-2026-49208
Symfony UX: Format-less date LiveProps parsed with the permissive DateTime constructor
5.3
CVSS
0.4%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 35% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
UX
ux · symfony
>= 3.0.0, < 3.1.0; >= 2.8.0, < 2.36.0 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-49208
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-49208
Patch
https://github.com/symfony/ux/commit/d24d78fda6df2d5964312255943ebf3a217b79a2
Release Notes
https://github.com/symfony/ux/releases/tag/v2.36.0
Release Notes
https://github.com/symfony/ux/releases/tag/v3.1.0
Vendor Advisory
https://github.com/symfony/ux/security/advisories/GHSA-89g7-22c8-3j23
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