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.
CVE-2026-49208
MEDIUMNVD 5.35.3—Trending — 4 sources updated this week
EchelonGraph scoreMEDIUM confidence
This medium-severity CVE scores 5.3 under NVD CVSS v3. EPSS exploit probability: 0.2%, top 85% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
Triggered by: NVD CVSS baseline
Sources: epss, nvd
5.3
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
- Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 5.3Exploit: NoneExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 5.3
- EG Score
- 5.3(medium)
- EG Risk
- 39(Track)EG Risk 39/100SSVC: Track
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
How it’s computedSeverity53% × 45%Exploitation0% × 40%Automatability100% × 15%Action: Routine — remediate on your standard cadence. - EPSS
- 15.2%
- KEV
- Not listed
Published
June 19, 2026
Last Modified
July 21, 2026
Advisory Details (4)
Auto-updated Jul 17, 2026Patch available. Sources: github_commit, github_release, github.
github Patch Available
Format-less date LiveProps parsed with the permissive DateTime constructor · Advisory · symfony/ux · GitHub
https://github.com/symfony/ux/security/advisories/GHSA-89g7-22c8-3j23github_release Patch Available
v3.1.0
Patch available: symfony/ux v3.1.0
https://github.com/symfony/ux/releases/tag/v3.1.0github_release Patch Available
v2.36.0
Patch available: symfony/ux v2.36.0
https://github.com/symfony/ux/releases/tag/v2.36.0github_commit Patch Available
commit d24d78fda6df (symfony/ux)
Patch available: symfony/ux v2.36.0 (contains commit d24d78fda6df)
https://github.com/symfony/ux/commit/d24d78fda6df2d5964312255943ebf3a217b79a2Vendor Advisories for CVE-2026-49208(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Affected Packages
(1 across 1 ecosystem)
Packagist(1)
| Package | Vulnerable range | Fixed in | Dependents |
|---|---|---|---|
| symfony/ux-live-component | v3.0.0 | 3.1.0 | — |
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 10× in last 7d / 10× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-07-23 03:18 UTCEG score recompute▼ 1.60
- 2026-07-22 14:08 UTCEPSS rescore
- 2026-07-21 15:25 UTCEPSS rescore
- 2026-07-20 17:08 UTCEPSS rescore
- 2026-07-20 17:06 UTCNVD updateCVSS v3 → 5.3
- 2026-07-19 14:31 UTCEPSS rescore
- 2026-07-19 14:31 UTCEPSS rescore
- 2026-07-19 02:29 UTCEPSS rescore
- 2026-07-17 16:20 UTCEG score recompute▲ 6.90
- 2026-07-17 16:19 UTCMITRE cvelistV5CVSS v3 → 6.9 · CVSS v4 → 6.9
- 2026-06-19 19:36 UTCEG score recompute
Related CVEs(same CWE)
Frequently asked(5)
What is CVE-2026-49208?
CVE-2026-49208 is a medium vulnerability published on June 19, 2026. 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…
When was CVE-2026-49208 disclosed?
CVE-2026-49208 was first published in the National Vulnerability Database on June 19, 2026, with the most recent update on July 21, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-49208 actively exploited?
CVE-2026-49208 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 15.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-49208?
CVE-2026-49208 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-49208?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-49208, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-49208
Is Your Infrastructure Affected by CVE-2026-49208?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.