CVE-2026-49208
Symfony UX: Format-less date LiveProps parsed with the permissive DateTime constructor
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.
INFO
Published Date :
July 17, 2026, 5:17 p.m.
Last Modified :
July 21, 2026, 3:16 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 4.0 | MEDIUM | [email protected] |
Solution
- Update Symfony UX to version 2.36.0 or later.
- Update Symfony UX to version 3.1.0 or later.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-49208.
| URL | Resource |
|---|---|
| https://github.com/symfony/ux/commit/d24d78fda6df2d5964312255943ebf3a217b79a2 | Patch |
| https://github.com/symfony/ux/releases/tag/v2.36.0 | Release Notes |
| https://github.com/symfony/ux/releases/tag/v3.1.0 | Release Notes |
| https://github.com/symfony/ux/security/advisories/GHSA-89g7-22c8-3j23 | Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-49208 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-49208
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-49208 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-49208 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jul. 21, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-49208', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'yes'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-07-21T01:41:38.338710Z'} -
Initial Analysis by [email protected]
Jul. 20, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N Added CPE Configuration OR *cpe:2.3:a:symfony:ux:3.0.0:*:*:*:*:*:*:* *cpe:2.3:a:symfony:ux:*:*:*:*:*:*:*:* versions from (including) 2.8.0 up to (excluding) 2.36.0 Added Reference Type GitHub, Inc.: https://github.com/symfony/ux/commit/d24d78fda6df2d5964312255943ebf3a217b79a2 Types: Patch Added Reference Type GitHub, Inc.: https://github.com/symfony/ux/releases/tag/v2.36.0 Types: Release Notes Added Reference Type GitHub, Inc.: https://github.com/symfony/ux/releases/tag/v3.1.0 Types: Release Notes Added Reference Type GitHub, Inc.: https://github.com/symfony/ux/security/advisories/GHSA-89g7-22c8-3j23 Types: Vendor Advisory -
New CVE Received by [email protected]
Jul. 17, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'symfony', 'product': 'ux', 'versions': [{'status': 'affected', 'version': '>= 3.0.0, < 3.1.0'}, {'status': 'affected', 'version': '>= 2.8.0, < 2.36.0'}]}] Added 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. Added CVSS V4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-20 Added Reference https://github.com/symfony/ux/commit/d24d78fda6df2d5964312255943ebf3a217b79a2 Added Reference https://github.com/symfony/ux/releases/tag/v2.36.0 Added Reference https://github.com/symfony/ux/releases/tag/v3.1.0 Added Reference https://github.com/symfony/ux/security/advisories/GHSA-89g7-22c8-3j23