CVE-2026-7663

CRITICALNVD 9.89.1▼
EchelonGraph scoreHIGH confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-06-30. NVD baseline CVSS 9.8; sources differ by 0.7.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 4 sources updated this week
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.8Exploit: NoneExposed: 0

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

IBM Langflow OSS 1.0.0 through 1.9.6 could allow unauthenticated attackers to access protected MCP project resources and execute MCP operations due to improper authorization enforcement in the Streamable MCP transport endpoint.

CVSS v3
9.8
EG Score
9.1(high)
EPSS
17.2%
KEV
Not listed

Published

June 30, 2026

Last Modified

July 2, 2026

Advisory Details (1)

Auto-updated Jul 3, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

Security Bulletin: Unauthenticated Cross-User MCP Resource Access and Tool Execution via Streamable Transport Authorization Bypass

https://www.ibm.com/support/pages/node/7277570

Vendor Advisories for CVE-2026-7663(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 96× in last 7d / 96× 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. 2026-07-07 06:01 UTCEG score recompute
  2. 2026-07-07 06:01 UTCGHSA enrichment
  3. 2026-07-07 02:22 UTCEG score recompute
  4. 2026-07-07 02:22 UTCGHSA enrichment
  5. 2026-07-06 22:43 UTCEG score recompute
  6. 2026-07-06 22:43 UTCGHSA enrichment
  7. 2026-07-06 19:04 UTCEG score recompute
  8. 2026-07-06 19:04 UTCGHSA enrichment
  9. 2026-07-06 16:27 UTCEPSS rescore
  10. 2026-07-06 16:27 UTCEPSS rescore
  11. 2026-07-06 15:25 UTCEG score recompute
  12. 2026-07-06 15:24 UTCGHSA enrichment
  13. 2026-07-06 11:45 UTCEG score recompute
  14. 2026-07-06 11:44 UTCGHSA enrichment
  15. 2026-07-06 08:06 UTCEG score recompute
  16. 2026-07-06 08:06 UTCGHSA enrichment
  17. 2026-07-06 04:26 UTCEG score recompute
  18. 2026-07-06 04:26 UTCGHSA enrichment
  19. 2026-07-06 02:23 UTCEPSS rescore
  20. 2026-07-06 02:23 UTCEPSS rescore
  21. 2026-07-06 00:42 UTCEG score recompute
  22. 2026-07-06 00:42 UTCGHSA enrichment
  23. 2026-07-05 21:03 UTCEG score recompute
  24. 2026-07-05 21:03 UTCGHSA enrichment
  25. 2026-07-05 17:25 UTCEG score recompute
Show 71 more
  1. 2026-07-05 17:24 UTCGHSA enrichment
  2. 2026-07-05 13:46 UTCEG score recompute
  3. 2026-07-05 13:46 UTCGHSA enrichment
  4. 2026-07-05 10:08 UTCEG score recompute
  5. 2026-07-05 10:08 UTCGHSA enrichment
  6. 2026-07-05 06:27 UTCEG score recompute
  7. 2026-07-05 06:27 UTCGHSA enrichment
  8. 2026-07-05 02:48 UTCEG score recompute
  9. 2026-07-05 02:48 UTCGHSA enrichment
  10. 2026-07-05 02:31 UTCEPSS rescore
  11. 2026-07-05 02:30 UTCEPSS rescore
  12. 2026-07-04 23:09 UTCEG score recompute
  13. 2026-07-04 23:09 UTCGHSA enrichment
  14. 2026-07-04 19:31 UTCEG score recompute
  15. 2026-07-04 19:31 UTCGHSA enrichment
  16. 2026-07-04 15:52 UTCEG score recompute
  17. 2026-07-04 15:52 UTCGHSA enrichment
  18. 2026-07-04 12:14 UTCEG score recompute
  19. 2026-07-04 12:14 UTCGHSA enrichment
  20. 2026-07-04 08:34 UTCEG score recompute
  21. 2026-07-04 08:34 UTCGHSA enrichment
  22. 2026-07-04 06:31 UTCEPSS rescore
  23. 2026-07-04 06:31 UTCEPSS rescore
  24. 2026-07-04 04:56 UTCEG score recompute
  25. 2026-07-04 04:55 UTCGHSA enrichment
  26. 2026-07-04 01:12 UTCEG score recompute
  27. 2026-07-04 01:12 UTCGHSA enrichment
  28. 2026-07-03 21:33 UTCEG score recompute
  29. 2026-07-03 21:33 UTCGHSA enrichment
  30. 2026-07-03 17:55 UTCEG score recompute
  31. 2026-07-03 17:55 UTCGHSA enrichment
  32. 2026-07-03 14:15 UTCEG score recompute
  33. 2026-07-03 14:14 UTCGHSA enrichment
  34. 2026-07-03 10:36 UTCEG score recompute
  35. 2026-07-03 10:36 UTCGHSA enrichment
  36. 2026-07-03 06:53 UTCEG score recompute
  37. 2026-07-03 06:52 UTCGHSA enrichment
  38. 2026-07-03 03:11 UTCEG score recompute
  39. 2026-07-03 03:11 UTCGHSA enrichment
  40. 2026-07-02 23:32 UTCEG score recompute
  41. 2026-07-02 23:32 UTCGHSA enrichment
  42. 2026-07-02 20:05 UTCNVD updateCVSS v3 → 9.8
  43. 2026-07-02 19:54 UTCEG score recompute
  44. 2026-07-02 19:54 UTCGHSA enrichment
  45. 2026-07-02 16:16 UTCEG score recompute
  46. 2026-07-02 16:16 UTCGHSA enrichment
  47. 2026-07-02 12:38 UTCEG score recompute
  48. 2026-07-02 12:38 UTCGHSA enrichment
  49. 2026-07-02 08:59 UTCEG score recompute
  50. 2026-07-02 08:59 UTCGHSA enrichment
  51. 2026-07-02 05:21 UTCEG score recompute
  52. 2026-07-02 05:21 UTCGHSA enrichment
  53. 2026-07-02 01:44 UTCEG score recompute
  54. 2026-07-02 01:43 UTCGHSA enrichment
  55. 2026-07-01 22:05 UTCEG score recompute
  56. 2026-07-01 22:05 UTCGHSA enrichment
  57. 2026-07-01 18:23 UTCEG score recompute
  58. 2026-07-01 18:23 UTCGHSA enrichment
  59. 2026-07-01 15:07 UTCEPSS rescore
  60. 2026-07-01 14:44 UTCEG score recompute
  61. 2026-07-01 14:44 UTCGHSA enrichment
  62. 2026-07-01 11:06 UTCEG score recompute
  63. 2026-07-01 11:06 UTCGHSA enrichment
  64. 2026-07-01 07:28 UTCEG score recompute
  65. 2026-07-01 07:28 UTCGHSA enrichment
  66. 2026-07-01 03:50 UTCEG score recompute
  67. 2026-07-01 03:50 UTCGHSA enrichment
  68. 2026-07-01 00:12 UTCEG score recompute
  69. 2026-07-01 00:12 UTCGHSA enrichment
  70. 2026-06-30 20:34 UTCEG score recompute
  71. 2026-06-30 20:33 UTCNVD updatefirst tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-7663?
CVE-2026-7663 is a critical vulnerability published on June 30, 2026. IBM Langflow OSS 1.0.0 through 1.9.6 could allow unauthenticated attackers to access protected MCP project resources and execute MCP operations due to improper authorization enforcement in the Streamable MCP transport endpoint.
When was CVE-2026-7663 disclosed?
CVE-2026-7663 was first published in the National Vulnerability Database on June 30, 2026, with the most recent update on July 2, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-7663 actively exploited?
CVE-2026-7663 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 17.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-7663?
CVE-2026-7663 has a CVSS v3 base score of 9.8 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.1.
How do I remediate CVE-2026-7663?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-7663, 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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