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 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
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: None knownExposed: 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 PROB
0%
EPSS %ILE
15%
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 11× in last 7d / 51× 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. 2026-08-26 14:46 UTCEPSS rescore
  2. 2026-08-25 13:49 UTCEPSS rescore
  3. 2026-08-25 02:31 UTCEG score recompute
  4. 2026-08-24 14:00 UTCEG score recompute
  5. 2026-08-23 12:15 UTCEG score recompute
  6. 2026-08-23 00:19 UTCEPSS rescore
  7. 2026-08-22 23:45 UTCEG score recompute
  8. 2026-08-21 23:49 UTCEPSS rescore
  9. 2026-08-21 09:26 UTCEG score recompute
  10. 2026-08-20 22:55 UTCEPSS rescore
  11. 2026-08-20 08:01 UTCEG score recompute
  12. 2026-08-19 17:04 UTCEPSS rescore
  13. 2026-08-19 07:04 UTCEG score recompute
  14. 2026-08-18 13:48 UTCEPSS rescore
  15. 2026-08-17 13:47 UTCEPSS rescore
  16. 2026-08-16 22:25 UTCEG score recompute
  17. 2026-08-16 14:56 UTCEPSS rescore
  18. 2026-08-16 09:54 UTCEG score recompute
  19. 2026-08-16 02:14 UTCEPSS rescore
  20. 2026-08-15 08:52 UTCEG score recompute
  21. 2026-08-15 01:30 UTCEPSS rescore
  22. 2026-08-14 07:19 UTCEG score recompute
  23. 2026-08-13 22:00 UTCEPSS rescore
  24. 2026-08-12 17:19 UTCEG score recompute
  25. 2026-08-12 13:51 UTCEPSS rescore
Show 43 more
  1. 2026-08-11 03:23 UTCEG score recompute
  2. 2026-08-11 00:00 UTCEPSS rescore
  3. 2026-08-09 13:52 UTCEG score recompute
  4. 2026-08-09 13:46 UTCEPSS rescore
  5. 2026-08-09 01:22 UTCEG score recompute
  6. 2026-08-08 16:37 UTCEPSS rescore
  7. 2026-08-08 00:20 UTCEG score recompute
  8. 2026-08-06 23:14 UTCEG score recompute
  9. 2026-08-06 13:47 UTCEPSS rescore
  10. 2026-08-05 21:21 UTCEG score recompute
  11. 2026-08-05 19:17 UTCEPSS rescore
  12. 2026-08-04 16:10 UTCEG score recompute
  13. 2026-08-04 15:10 UTCEPSS rescore
  14. 2026-08-04 10:39 UTCEPSS rescore
  15. 2026-08-03 15:09 UTCEG score recompute
  16. 2026-08-03 10:36 UTCEPSS rescore
  17. 2026-08-02 14:02 UTCEG score recompute
  18. 2026-08-02 02:27 UTCEPSS rescore
  19. 2026-08-01 13:00 UTCEG score recompute
  20. 2026-08-01 04:16 UTCEPSS rescore
  21. 2026-07-30 22:19 UTCEG score recompute
  22. 2026-07-30 16:28 UTCEPSS rescore
  23. 2026-07-30 02:55 UTCEG score recompute
  24. 2026-07-30 01:30 UTCEPSS rescore
  25. 2026-07-29 01:35 UTCEG score recompute
  26. 2026-07-28 15:37 UTCEPSS rescore
  27. 2026-07-27 21:21 UTCEG score recompute
  28. 2026-07-26 16:50 UTCEG score recompute
  29. 2026-07-26 14:54 UTCEPSS rescore
  30. 2026-07-25 14:18 UTCEPSS rescore
  31. 2026-07-24 14:18 UTCEPSS rescore
  32. 2026-07-23 14:18 UTCEPSS rescore
  33. 2026-07-23 03:18 UTCEG score recompute▲ 0.60
  34. 2026-07-22 14:08 UTCEPSS rescore
  35. 2026-07-21 15:25 UTCEPSS rescore
  36. 2026-07-20 17:08 UTCEPSS rescore
  37. 2026-07-20 17:06 UTCNVD updateCVSS v3 → 7.5 · severity → HIGH
  38. 2026-07-19 14:31 UTCEPSS rescore
  39. 2026-07-19 14:31 UTCEPSS rescore
  40. 2026-07-19 02:29 UTCEPSS rescore
  41. 2026-07-17 16:20 UTCEG score recompute▲ 6.90
  42. 2026-07-17 16:19 UTCMITRE cvelistV5CVSS v3 → 6.9 · CVSS v4 → 6.9 · severity → MEDIUM
  43. 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 0% probability of exploitation in the next 30 days, which ranks it in the top 84.9% of all scored CVEs.
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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