CVE-2026-42998

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 — 3 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. The Keystone application credential authentication plugin does not verify that the user supplied in the authentication request matches the owner of the application credential. An attacker can authenticate with their own application credential ID and secret while specifying a different user's name and domain in the request body. Keystone issues a token attributed to the victim user. The impersonated token is project-scoped and carries the intersection of the application credential's roles and the victim's actual roles on the project. This enables audit evasion, reading the victim's credentials, and acting as the victim within shared projects.

CVSS v3
8.8
EG Score
6.0(medium)
EPSS
22.2%
KEV
Not listed

Published

May 28, 2026

Last Modified

June 2, 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-2026-42998(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 (2:29.0.0-0ubuntu1.2) @ resolute2026-07-11ubuntu

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(1)

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 9× in last 7d / 67× 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 129 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-42998?
CVE-2026-42998 is a high vulnerability published on May 28, 2026. An issue was discovered in OpenStack Keystone before 29.0.2. The Keystone application credential authentication plugin does not verify that the user supplied in the authentication request matches the owner of the application credential. An attacker can authenticate with their own application…
When was CVE-2026-42998 disclosed?
CVE-2026-42998 was first published in the National Vulnerability Database on May 28, 2026, with the most recent update on June 2, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-42998 actively exploited?
CVE-2026-42998 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 22.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-42998?
CVE-2026-42998 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-2026-42998?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-42998, 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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