CVE-2026-49212

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 0.2%, top 94% 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
Trending — 4 sources updated this week
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.5Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Symfony UX is a JavaScript ecosystem for Symfony. From 2.8.0 until 2.36.0 and 3.1.0, the HMAC computed by Symfony\UX\LiveComponent\LiveComponentHydrator covered only sorted prop key/value pairs and did not include the component name, the slot identifier (props vs propsFromParent), or request context, allowing a signed blob minted for one component or slot to be replayed in another and set a read-only prop on a target component. This issue is fixed in versions 2.36.0 and 3.1.0.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
38(Track)
EG Risk 38/100SSVC: 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 computed
Severity75% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
5.8%
KEV
Not listed

Published

June 19, 2026

Last Modified

July 20, 2026

Advisory Details (4)

Auto-updated Jul 17, 2026
Patch available. Sources: github_commit, github_release, github.
github Patch Available

LiveComponentHydrator HMAC checksum lacks component and slot binding · Advisory · symfony/ux · GitHub

https://github.com/symfony/ux/security/advisories/GHSA-34w5-c283-j9fg
github_release Patch Available

v3.1.0

Patch available: symfony/ux v3.1.0

https://github.com/symfony/ux/releases/tag/v3.1.0
github_release Patch Available

v2.36.0

Patch available: symfony/ux v2.36.0

https://github.com/symfony/ux/releases/tag/v2.36.0
github_commit Patch Available

commit a224b5af3e2e (symfony/ux)

Patch available: symfony/ux v2.36.0 (contains commit a224b5af3e2e)

https://github.com/symfony/ux/commit/a224b5af3e2e33ee14ac71356ae0e0877900a81c

Vendor Advisories for CVE-2026-49212(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)
PackageVulnerable rangeFixed inDependents
symfony/ux-live-componentv3.0.03.1.0—

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.

  1. 2026-07-23 03:18 UTCEG score recompute▲ 0.60
  2. 2026-07-22 14:08 UTCEPSS rescore
  3. 2026-07-21 15:25 UTCEPSS rescore
  4. 2026-07-20 17:08 UTCEPSS rescore
  5. 2026-07-20 17:06 UTCNVD updateCVSS v3 → 7.5 · severity → HIGH
  6. 2026-07-19 14:31 UTCEPSS rescore
  7. 2026-07-19 14:31 UTCEPSS rescore
  8. 2026-07-19 02:29 UTCEPSS rescore
  9. 2026-07-17 16:20 UTCEG score recompute▲ 6.90
  10. 2026-07-17 16:19 UTCMITRE cvelistV5CVSS v3 → 6.9 · CVSS v4 → 6.9 · severity → MEDIUM
  11. 2026-06-19 19:36 UTCEG score recompute

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-49212?
CVE-2026-49212 is a high 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, the HMAC computed by Symfony\UX\LiveComponent\LiveComponentHydrator covered only sorted prop key/value pairs and did not include the component name, the slot identifier (props vs propsFromParent), or request…
When was CVE-2026-49212 disclosed?
CVE-2026-49212 was first published in the National Vulnerability Database on June 19, 2026, with the most recent update on July 20, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-49212 actively exploited?
CVE-2026-49212 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 5.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-49212?
CVE-2026-49212 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-49212?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-49212, 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

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