CVE-2026-43000

HIGHNVD 8.86.0▼
EchelonGraph scoreMEDIUM confidence

Score 6.0 from GitHub Security Advisory published 2026-05-28. NVD baseline CVSS 8.8; sources differ by 2.8.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 5 sources updated this week
8.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.8Exploit: NoneExposed: 0

A fix is available — apply it.

An issue was discovered in OpenStack Keystone before 29.0.2. When combined with an application credential impersonation vulnerability, an attacker with the member role on a project can escalate to admin by chaining unrestricted application credentials with Keystone trusts. The impersonated token carries the victim's identity, which passes the trustor validation check. Keystone then validates the delegated roles against the victim's actual role assignments in the database, not the roles on the requesting token. This allows the attacker to create a trust delegating the victim's admin role to themselves. The trust persists independently, and additional trusts and application credentials can be created to maintain access. All actions are logged under the victim's identity.

CVSS v3
8.8
EG Score
6.0(medium)
EPSS
24.8%
KEV
Not listed

Published

May 28, 2026

Last Modified

July 15, 2026

Advisory Details (2)

Auto-updated Jun 9, 2026
No patch confirmed yet.
generic

OSSA-2026-015: Multiple credential delegation and authorization bypass vulnerabilities in Keystone — OpenStack Security Advisories 0.0.1.dev342 documentation

https://security.openstack.org/ossa/OSSA-2026-015.html
generic

Bug #2148477 “[OSSA-2026-015] Impersonation via application cred...” : Bugs : OpenStack Identity (keystone)

https://bugs.launchpad.net/keystone/+bug/2148477

Vendor Advisories for CVE-2026-43000(1)

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

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntupython3-keystone (2:28.0.0-0ubuntu1.3) @ questing2026-07-11ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)
PyPI(1)
PackageVulnerable rangeFixed inDependents
keystone14.0.0 ... 27.0.1 (50 versions)27.0.2—

Weakness Classification(2)

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

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 11× in last 7d / 69× 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.

Showing the most recent 100 of 131 total refreshes for this CVE.

  1. 2026-07-15 16:57 UTCEPSS rescore
  2. 2026-07-15 02:26 UTCNVD updateCVSS v3 → 8.8 · severity → HIGH
  3. 2026-07-15 02:00 UTCEPSS rescore
  4. 2026-07-15 01:21 UTCMITRE cvelistV5CVSS v3 → 6 · severity → MEDIUM
  5. 2026-07-13 22:30 UTCEPSS rescore
  6. 2026-07-13 06:13 UTCEPSS rescore
  7. 2026-07-12 05:46 UTCEPSS rescore
  8. 2026-07-11 22:35 UTCEG score recompute
  9. 2026-07-11 22:35 UTCVendor advisory
  10. 2026-07-11 08:27 UTCEPSS rescore
  11. 2026-07-09 19:10 UTCEPSS rescore
  12. 2026-07-08 22:50 UTCEG score recompute
  13. 2026-07-08 22:50 UTCVendor advisory
  14. 2026-07-08 15:16 UTCEPSS rescore
  15. 2026-07-07 13:46 UTCEPSS rescore
  16. 2026-07-06 16:27 UTCEPSS rescore
  17. 2026-07-06 02:23 UTCEPSS rescore
  18. 2026-07-06 02:23 UTCEPSS rescore
  19. 2026-07-05 02:30 UTCEPSS rescore
  20. 2026-07-04 06:31 UTCEPSS rescore
  21. 2026-07-02 23:31 UTCEG score recompute
  22. 2026-07-02 23:31 UTCVendor advisory
  23. 2026-07-01 15:06 UTCEPSS rescore
  24. 2026-07-01 03:46 UTCEG score recompute
  25. 2026-07-01 03:46 UTCVendor advisory
Show 75 more
  1. 2026-07-01 03:46 UTCGHSA enrichment
  2. 2026-06-30 23:22 UTCEPSS rescore
  3. 2026-06-29 22:08 UTCEG score recompute
  4. 2026-06-29 22:08 UTCVendor advisory
  5. 2026-06-29 22:08 UTCGHSA enrichment
  6. 2026-06-29 14:06 UTCEPSS rescore
  7. 2026-06-28 22:22 UTCEG score recompute
  8. 2026-06-28 22:22 UTCVendor advisory
  9. 2026-06-28 22:22 UTCGHSA enrichment
  10. 2026-06-28 14:07 UTCEPSS rescore
  11. 2026-06-28 04:56 UTCEPSS rescore
  12. 2026-06-27 22:40 UTCEG score recompute
  13. 2026-06-27 22:40 UTCVendor advisory
  14. 2026-06-27 22:40 UTCGHSA enrichment
  15. 2026-06-27 03:08 UTCEPSS rescore
  16. 2026-06-26 22:58 UTCEG score recompute
  17. 2026-06-26 22:58 UTCVendor advisory
  18. 2026-06-26 22:57 UTCGHSA enrichment
  19. 2026-06-25 22:52 UTCEG score recompute
  20. 2026-06-25 22:52 UTCVendor advisory
  21. 2026-06-25 22:52 UTCGHSA enrichment
  22. 2026-06-25 13:49 UTCEPSS rescore
  23. 2026-06-25 13:49 UTCEPSS rescore
  24. 2026-06-24 23:10 UTCEG score recompute
  25. 2026-06-24 23:10 UTCVendor advisory
  26. 2026-06-24 23:10 UTCGHSA enrichment
  27. 2026-06-24 14:05 UTCEPSS rescore
  28. 2026-06-23 21:33 UTCEPSS rescore
  29. 2026-06-22 14:25 UTCEPSS rescore
  30. 2026-06-22 14:25 UTCEPSS rescore
  31. 2026-06-21 14:56 UTCEPSS rescore
  32. 2026-06-21 14:56 UTCEPSS rescore
  33. 2026-06-21 01:59 UTCEPSS rescore
  34. 2026-06-19 19:25 UTCEPSS rescore
  35. 2026-06-18 17:52 UTCEPSS rescore
  36. 2026-06-18 17:52 UTCEPSS rescore
  37. 2026-06-17 21:11 UTCEG score recompute
  38. 2026-06-17 21:11 UTCVendor advisory
  39. 2026-06-17 21:10 UTCGHSA enrichment
  40. 2026-06-17 17:53 UTCEPSS rescore
  41. 2026-06-16 21:25 UTCEG score recompute
  42. 2026-06-16 21:25 UTCVendor advisory
  43. 2026-06-16 21:25 UTCGHSA enrichment
  44. 2026-06-16 17:52 UTCEPSS rescore
  45. 2026-06-15 21:43 UTCEG score recompute
  46. 2026-06-15 21:43 UTCGHSA enrichment
  47. 2026-06-15 17:49 UTCEPSS rescore
  48. 2026-06-14 21:03 UTCEG score recompute
  49. 2026-06-14 21:03 UTCGHSA enrichment
  50. 2026-06-13 23:00 UTCEPSS rescore
  51. 2026-06-13 21:22 UTCEG score recompute
  52. 2026-06-13 21:22 UTCGHSA enrichment
  53. 2026-06-12 23:12 UTCEPSS rescore
  54. 2026-06-12 23:12 UTCEPSS rescore
  55. 2026-06-12 21:40 UTCEG score recompute
  56. 2026-06-12 21:40 UTCGHSA enrichment
  57. 2026-06-11 21:59 UTCEG score recompute
  58. 2026-06-11 21:59 UTCGHSA enrichment
  59. 2026-06-11 14:00 UTCEPSS rescore
  60. 2026-06-10 22:18 UTCEPSS rescore
  61. 2026-06-10 22:18 UTCEG score recompute
  62. 2026-06-10 22:18 UTCGHSA enrichment
  63. 2026-06-10 13:22 UTCEPSS rescore
  64. 2026-06-10 13:22 UTCEPSS rescore
  65. 2026-06-09 22:36 UTCEG score recompute
  66. 2026-06-09 22:36 UTCGHSA enrichment
  67. 2026-06-08 23:31 UTCNVD updateCVSS v3 → 8.8 · severity → HIGH
  68. 2026-06-08 22:55 UTCEG score recompute
  69. 2026-06-08 22:55 UTCGHSA enrichment
  70. 2026-06-08 14:17 UTCEPSS rescore
  71. 2026-06-08 14:17 UTCEPSS rescore
  72. 2026-06-07 23:13 UTCEG score recompute
  73. 2026-06-07 23:13 UTCGHSA enrichment
  74. 2026-06-07 15:25 UTCEPSS rescore
  75. 2026-06-07 15:25 UTCEPSS rescore

Frequently asked(5)

What is CVE-2026-43000?
CVE-2026-43000 is a high vulnerability published on May 28, 2026. An issue was discovered in OpenStack Keystone before 29.0.2. When combined with an application credential impersonation vulnerability, an attacker with the member role on a project can escalate to admin by chaining unrestricted application credentials with Keystone trusts. The impersonated token…
When was CVE-2026-43000 disclosed?
CVE-2026-43000 was first published in the National Vulnerability Database on May 28, 2026, with the most recent update on July 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-43000 actively exploited?
CVE-2026-43000 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 24.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-43000?
CVE-2026-43000 has a CVSS v3 base score of 8.8 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 6.0.
How do I remediate CVE-2026-43000?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-43000, 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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