CVE-2026-49215

MEDIUMNVD 5.45.4—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.4 under NVD CVSS v3. EPSS exploit probability: 0.2%, top 93% 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
5.4EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.4Exploit: 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 2.22.0 until 2.36.0 and 3.1.0, Symfony\UX\LiveComponent\EventListener\LiveComponentSubscriber::isLiveComponentRequest() gates #[LiveAction] invocations on Accept: application/vnd.live-component+html, but the Accept header is CORS-safelisted and cross-origin fetch() can set it without preflight, allowing forged cross-origin #[LiveAction] requests against a victim session when applications use SameSite=None, credentials: 'include', a permissive cookie policy, or a same-origin pivot. This issue is fixed in versions 2.36.0 and 3.1.0.

CVSS v3
5.4
EG Score
5.4(medium)
EG Risk
24(Track)
EG Risk 24/100SSVC: 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
Severity54% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
7%
KEV
Not listed

Published

June 19, 2026

Last Modified

July 20, 2026

Advisory Details (4)

Auto-updated Jul 26, 2026
Patch available. Sources: github_commit, github_release, github.
github Patch Available

CSRF Protection Bypass in symfony/ux-live-component — Accept Header is CORS-Safelisted · Advisory · symfony/ux · GitHub

https://github.com/symfony/ux/security/advisories/GHSA-4m4j-hmqq-3gxm
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 aed7493db2b4 (symfony/ux)

Patch available: symfony/ux v2.36.0 (contains commit aed7493db2b4)

https://github.com/symfony/ux/commit/aed7493db2b4b7bf1f9c79b33cda544f06904b27

Vendor Advisories for CVE-2026-49215(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 9× in last 7d / 47× 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. 2026-08-24 22:21 UTCEG score recompute
  3. 2026-08-23 23:16 UTCEG score recompute
  4. 2026-08-23 00:19 UTCEPSS rescore
  5. 2026-08-22 23:45 UTCEG score recompute
  6. 2026-08-21 23:49 UTCEPSS rescore
  7. 2026-08-21 07:21 UTCEG score recompute
  8. 2026-08-20 22:55 UTCEPSS rescore
  9. 2026-08-20 08:01 UTCEG score recompute
  10. 2026-08-19 17:04 UTCEPSS rescore
  11. 2026-08-19 07:04 UTCEG score recompute
  12. 2026-08-18 13:48 UTCEPSS rescore
  13. 2026-08-17 15:14 UTCEG score recompute
  14. 2026-08-17 13:47 UTCEPSS rescore
  15. 2026-08-16 16:09 UTCEG score recompute
  16. 2026-08-16 14:56 UTCEPSS rescore
  17. 2026-08-16 02:14 UTCEPSS rescore
  18. 2026-08-15 17:04 UTCEG score recompute
  19. 2026-08-15 01:30 UTCEPSS rescore
  20. 2026-08-14 17:54 UTCEG score recompute
  21. 2026-08-13 22:00 UTCEPSS rescore
  22. 2026-08-12 18:22 UTCEG score recompute
  23. 2026-08-12 13:51 UTCEPSS rescore
  24. 2026-08-11 19:16 UTCEG score recompute
  25. 2026-08-11 00:00 UTCEPSS rescore
Show 38 more
  1. 2026-08-08 22:01 UTCEG score recompute
  2. 2026-08-08 16:37 UTCEPSS rescore
  3. 2026-08-07 22:56 UTCEG score recompute
  4. 2026-08-06 23:51 UTCEG score recompute
  5. 2026-08-06 13:47 UTCEPSS rescore
  6. 2026-08-06 00:45 UTCEG score recompute
  7. 2026-08-05 19:17 UTCEPSS rescore
  8. 2026-08-05 01:40 UTCEG score recompute
  9. 2026-08-04 15:10 UTCEPSS rescore
  10. 2026-08-04 10:39 UTCEPSS rescore
  11. 2026-08-04 02:19 UTCEG score recompute
  12. 2026-08-03 10:36 UTCEPSS rescore
  13. 2026-08-02 04:09 UTCEG score recompute
  14. 2026-08-02 02:27 UTCEPSS rescore
  15. 2026-08-01 05:02 UTCEG score recompute
  16. 2026-08-01 04:16 UTCEPSS rescore
  17. 2026-07-31 03:47 UTCEG score recompute
  18. 2026-07-30 16:28 UTCEPSS rescore
  19. 2026-07-30 02:55 UTCEG score recompute
  20. 2026-07-30 01:30 UTCEPSS rescore
  21. 2026-07-29 01:35 UTCEG score recompute
  22. 2026-07-28 15:37 UTCEPSS rescore
  23. 2026-07-27 18:04 UTCEG score recompute
  24. 2026-07-26 16:50 UTCEG score recompute
  25. 2026-07-25 14:18 UTCEPSS rescore
  26. 2026-07-24 14:18 UTCEPSS rescore
  27. 2026-07-23 14:18 UTCEPSS rescore
  28. 2026-07-23 03:18 UTCEG score recompute▲ 3.30
  29. 2026-07-22 14:08 UTCEPSS rescore
  30. 2026-07-21 15:25 UTCEPSS rescore
  31. 2026-07-20 17:08 UTCEPSS rescore
  32. 2026-07-20 17:06 UTCNVD updateCVSS v3 → 5.4 · severity → MEDIUM
  33. 2026-07-19 14:31 UTCEPSS rescore
  34. 2026-07-19 14:31 UTCEPSS rescore
  35. 2026-07-19 02:29 UTCEPSS rescore
  36. 2026-07-17 16:20 UTCEG score recompute▲ 2.10
  37. 2026-07-17 16:19 UTCMITRE cvelistV5CVSS v3 → 2.1 · CVSS v4 → 2.1
  38. 2026-06-19 19:36 UTCEG score recompute

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-49215?
CVE-2026-49215 is a medium vulnerability published on June 19, 2026. Symfony UX is a JavaScript ecosystem for Symfony. From 2.22.0 until 2.36.0 and 3.1.0, Symfony\UX\LiveComponent\EventListener\LiveComponentSubscriber::isLiveComponentRequest() gates #[LiveAction] invocations on Accept: application/vnd.live-component+html, but the Accept header is CORS-safelisted and…
When was CVE-2026-49215 disclosed?
CVE-2026-49215 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-2026-49215 actively exploited?
CVE-2026-49215 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 92.7% of all scored CVEs.
What is the CVSS score of CVE-2026-49215?
CVE-2026-49215 has a CVSS v3 base score of 5.4 (NVD).
How do I remediate CVE-2026-49215?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-49215, 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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