CVE-2026-14538

HIGHNVD 7.77.7—
EchelonGraph scoreHIGH confidence

Score 7.7 from GitHub Security Advisory published 2026-07-31. NVD baseline CVSS 7.7; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
7.7EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.7Exploit: None knownExposed: 0

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

An improper authorization and security-boundary bypass vulnerability in the bigquery-execute-sql tool component of Google mcp-toolbox versions 0.16.1 through 1.4.0 allows an authenticated attacker to bypass allowedDatasets validation checks. The toolbox relies on the BigQuery dry-run API to enforce dataset restrictions, but due to a fail-open logic flaw, it bypasses validation when the API returns an empty array for specialized constructs. This allows the attacker to extract structural DDL schemas for explicitly excluded datasets via INFORMATION_SCHEMA, and access downstream federated row data via EXTERNAL_QUERY connections.

CVSS v3
7.7
EG Score
7.7(high)
EG Risk
35(Track)
EG Risk 35/100SSVC: 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
Severity77% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
9%
KEV
Not listed

Published

July 31, 2026

Last Modified

August 8, 2026

Advisory Details (1)

Auto-updated Jul 31, 2026
Patch available. Sources: github_pr.
github_pr Patch Available

fix(tool/bigquery-execute-sql): prevent dataset restriction bypass

Patch available: googleapis/mcp-toolbox v1.5.0 (PR #3452 merged 2026-06-18)

https://github.com/googleapis/mcp-toolbox/pull/3452

Vendor Advisories for CVE-2026-14538(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 29× in last 7d / 83× 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. 2026-08-21 05:11 UTCEG score recompute
  2. 2026-08-21 05:11 UTCGHSA enrichment
  3. 2026-08-20 22:55 UTCEPSS rescore
  4. 2026-08-20 18:19 UTCGHSA enrichment
  5. 2026-08-20 07:26 UTCGHSA enrichment
  6. 2026-08-19 20:34 UTCEG score recompute
  7. 2026-08-19 20:34 UTCGHSA enrichment
  8. 2026-08-19 17:03 UTCEPSS rescore
  9. 2026-08-19 09:42 UTCGHSA enrichment
  10. 2026-08-18 22:48 UTCEG score recompute
  11. 2026-08-18 22:48 UTCGHSA enrichment
  12. 2026-08-18 13:48 UTCEPSS rescore
  13. 2026-08-18 11:53 UTCGHSA enrichment
  14. 2026-08-18 01:01 UTCEG score recompute
  15. 2026-08-18 01:01 UTCGHSA enrichment
  16. 2026-08-17 13:16 UTCGHSA enrichment
  17. 2026-08-17 02:25 UTCGHSA enrichment
  18. 2026-08-16 15:33 UTCEG score recompute
  19. 2026-08-16 15:33 UTCGHSA enrichment
  20. 2026-08-16 14:56 UTCEPSS rescore
  21. 2026-08-16 04:41 UTCEG score recompute
  22. 2026-08-16 04:41 UTCGHSA enrichment
  23. 2026-08-16 02:14 UTCEPSS rescore
  24. 2026-08-15 17:49 UTCGHSA enrichment
  25. 2026-08-15 06:57 UTCEG score recompute
Show 58 more
  1. 2026-08-15 06:57 UTCGHSA enrichment
  2. 2026-08-15 01:30 UTCEPSS rescore
  3. 2026-08-14 19:47 UTCGHSA enrichment
  4. 2026-08-14 08:55 UTCGHSA enrichment
  5. 2026-08-13 22:03 UTCEG score recompute
  6. 2026-08-13 22:03 UTCGHSA enrichment
  7. 2026-08-13 22:00 UTCEPSS rescore
  8. 2026-08-13 11:11 UTCGHSA enrichment
  9. 2026-08-13 00:19 UTCEG score recompute
  10. 2026-08-13 00:19 UTCGHSA enrichment
  11. 2026-08-12 13:50 UTCEPSS rescore
  12. 2026-08-12 13:28 UTCGHSA enrichment
  13. 2026-08-12 02:34 UTCGHSA enrichment
  14. 2026-08-11 15:42 UTCEG score recompute
  15. 2026-08-11 15:42 UTCGHSA enrichment
  16. 2026-08-11 13:42 UTCEPSS rescore
  17. 2026-08-11 04:50 UTCEG score recompute
  18. 2026-08-11 04:50 UTCGHSA enrichment
  19. 2026-08-10 23:59 UTCEPSS rescore
  20. 2026-08-10 17:59 UTCGHSA enrichment
  21. 2026-08-10 06:52 UTCGHSA enrichment
  22. 2026-08-09 20:01 UTCEG score recompute
  23. 2026-08-09 20:01 UTCGHSA enrichment
  24. 2026-08-09 13:46 UTCEPSS rescore
  25. 2026-08-09 09:09 UTCGHSA enrichment
  26. 2026-08-08 22:18 UTCEG score recompute
  27. 2026-08-08 22:18 UTCGHSA enrichment
  28. 2026-08-08 16:37 UTCEPSS rescore
  29. 2026-08-08 11:26 UTCGHSA enrichment
  30. 2026-08-08 00:34 UTCEG score recompute▲ 2.00
  31. 2026-08-08 00:34 UTCGHSA enrichment
  32. 2026-08-08 00:34 UTCNVD updateCVSS v3 → 7.7 · severity → HIGH
  33. 2026-08-07 17:23 UTCEG score recompute
  34. 2026-08-07 17:23 UTCGHSA enrichment
  35. 2026-08-06 15:50 UTCEG score recompute
  36. 2026-08-06 15:50 UTCGHSA enrichment
  37. 2026-08-06 13:46 UTCEPSS rescore
  38. 2026-08-06 00:05 UTCEG score recompute
  39. 2026-08-06 00:05 UTCGHSA enrichment
  40. 2026-08-05 19:17 UTCEPSS rescore
  41. 2026-08-04 22:33 UTCEG score recompute
  42. 2026-08-04 22:33 UTCGHSA enrichment
  43. 2026-08-04 15:09 UTCEPSS rescore
  44. 2026-08-04 10:38 UTCEPSS rescore
  45. 2026-08-03 21:00 UTCEG score recompute
  46. 2026-08-03 21:00 UTCGHSA enrichment
  47. 2026-08-03 10:35 UTCEPSS rescore
  48. 2026-08-02 19:28 UTCEG score recompute
  49. 2026-08-02 19:28 UTCGHSA enrichment
  50. 2026-08-02 02:26 UTCEPSS rescore
  51. 2026-08-01 17:56 UTCEG score recompute
  52. 2026-08-01 17:56 UTCGHSA enrichment
  53. 2026-08-01 04:15 UTCEPSS rescore
  54. 2026-07-31 16:23 UTCEG score recompute
  55. 2026-07-31 16:23 UTCGHSA enrichment
  56. 2026-07-31 02:40 UTCEG score recompute
  57. 2026-07-31 01:55 UTCEG score recompute
  58. 2026-07-31 01:54 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-14538?
CVE-2026-14538 is a high vulnerability published on July 31, 2026. An improper authorization and security-boundary bypass vulnerability in the bigquery-execute-sql tool component of Google mcp-toolbox versions 0.16.1 through 1.4.0 allows an authenticated attacker to bypass allowedDatasets validation checks. The toolbox relies on the BigQuery dry-run API to enforce…
When was CVE-2026-14538 disclosed?
CVE-2026-14538 was first published in the National Vulnerability Database on July 31, 2026, with the most recent update on August 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-14538 actively exploited?
CVE-2026-14538 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 91.4% of all scored CVEs.
What is the CVSS score of CVE-2026-14538?
CVE-2026-14538 has a CVSS v3 base score of 7.7 (NVD).
How do I remediate CVE-2026-14538?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-14538, 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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