CVE-2026-42998

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.8 under NVD CVSS v3. EPSS exploit probability: 0.3%, top 78% of all CVEs by exploit prediction. GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, nvd
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.8Exploit: None knownExposed: 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
8.8(medium)
EG Risk
40(Track)
EG Risk 40/100SSVC: 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
Severity88% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
23%
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) @ resolute2026-08-25ubuntu

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

(5 across 5 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
keystone2:18.0.0-3, 2:18.0.0-3+deb11u1, 2:18.1.0-1+deb11u22:18.1.0-1+deb11u3—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
keystone2:22.0.0-2, 2:22.0.2-0+deb12u1, 2:22.0.2-0+deb12u22:22.0.2-0+deb12u3—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
keystone2:27.0.0-3, 2:27.0.0-3+deb13u1, 2:27.0.0-3+deb13u32:27.0.0-3+deb13u4—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
keystone2:27.0.0-3 ... 2:29.0.1-1 (16 versions)2:29.0.1-2—
PyPI(1)
PackageVulnerable rangeFixed inDependents
keystone14.0.0 ... 29.0.1 (54 versions)29.0.2—

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 5× in last 7d / 64× 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 201 total refreshes for this CVE.

  1. 2026-09-04 05:06 UTCEPSS rescore
  2. 2026-09-02 14:12 UTCEPSS rescore
  3. 2026-09-01 13:54 UTCEPSS rescore
  4. 2026-08-30 19:17 UTCEPSS rescore
  5. 2026-08-30 01:22 UTCEPSS rescore
  6. 2026-08-28 21:41 UTCEPSS rescore
  7. 2026-08-27 14:25 UTCEPSS rescore
  8. 2026-08-26 14:46 UTCEPSS rescore
  9. 2026-08-25 13:49 UTCEPSS rescore
  10. 2026-08-25 05:08 UTCEG score recompute
  11. 2026-08-25 05:08 UTCVendor advisory
  12. 2026-08-23 14:51 UTCEG score recompute
  13. 2026-08-23 14:51 UTCVendor advisory
  14. 2026-08-23 00:19 UTCEPSS rescore
  15. 2026-08-21 23:49 UTCEPSS rescore
  16. 2026-08-21 20:28 UTCVendor advisory
  17. 2026-08-21 01:01 UTCEG score recompute
  18. 2026-08-21 01:01 UTCVendor advisory
  19. 2026-08-20 22:55 UTCEPSS rescore
  20. 2026-08-20 11:11 UTCEG score recompute
  21. 2026-08-20 11:11 UTCVendor advisory
  22. 2026-08-19 17:03 UTCEPSS rescore
  23. 2026-08-18 13:48 UTCEPSS rescore
  24. 2026-08-17 13:47 UTCEPSS rescore
  25. 2026-08-17 09:08 UTCVendor advisory
Show 75 more
  1. 2026-08-16 16:23 UTCEG score recompute
  2. 2026-08-16 16:23 UTCVendor advisory
  3. 2026-08-16 14:56 UTCEPSS rescore
  4. 2026-08-16 02:42 UTCEG score recompute
  5. 2026-08-16 02:42 UTCVendor advisory
  6. 2026-08-16 02:14 UTCEPSS rescore
  7. 2026-08-15 03:45 UTCEG score recompute
  8. 2026-08-15 03:45 UTCVendor advisory
  9. 2026-08-15 01:30 UTCEPSS rescore
  10. 2026-08-14 14:33 UTCVendor advisory
  11. 2026-08-14 01:22 UTCEG score recompute
  12. 2026-08-14 01:22 UTCVendor advisory
  13. 2026-08-13 22:00 UTCEPSS rescore
  14. 2026-08-13 05:03 UTCVendor advisory
  15. 2026-08-12 15:52 UTCEG score recompute
  16. 2026-08-12 15:52 UTCVendor advisory
  17. 2026-08-12 13:51 UTCEPSS rescore
  18. 2026-08-12 02:41 UTCEG score recompute
  19. 2026-08-12 02:41 UTCVendor advisory
  20. 2026-08-11 13:43 UTCEPSS rescore
  21. 2026-08-11 13:30 UTCVendor advisory
  22. 2026-08-11 00:09 UTCEG score recompute
  23. 2026-08-11 00:09 UTCVendor advisory
  24. 2026-08-11 00:00 UTCEPSS rescore
  25. 2026-08-10 10:21 UTCVendor advisory
  26. 2026-08-09 21:10 UTCEG score recompute
  27. 2026-08-09 21:10 UTCVendor advisory
  28. 2026-08-09 13:46 UTCEPSS rescore
  29. 2026-08-09 08:00 UTCVendor advisory
  30. 2026-08-08 18:49 UTCEG score recompute
  31. 2026-08-08 18:49 UTCVendor advisory
  32. 2026-08-08 16:37 UTCEPSS rescore
  33. 2026-08-08 02:32 UTCEG score recompute
  34. 2026-08-08 02:32 UTCVendor advisory
  35. 2026-08-07 13:21 UTCVendor advisory
  36. 2026-08-07 00:11 UTCEG score recompute
  37. 2026-08-07 00:11 UTCVendor advisory
  38. 2026-08-06 13:46 UTCEPSS rescore
  39. 2026-08-06 10:00 UTCVendor advisory
  40. 2026-08-05 20:50 UTCEG score recompute
  41. 2026-08-05 20:50 UTCVendor advisory
  42. 2026-08-05 19:17 UTCEPSS rescore
  43. 2026-08-04 15:10 UTCEPSS rescore
  44. 2026-08-04 10:38 UTCEPSS rescore
  45. 2026-08-04 05:29 UTCVendor advisory
  46. 2026-08-03 16:18 UTCEG score recompute
  47. 2026-08-03 16:18 UTCVendor advisory
  48. 2026-08-03 10:36 UTCEPSS rescore
  49. 2026-08-02 17:22 UTCVendor advisory
  50. 2026-08-02 04:11 UTCEG score recompute
  51. 2026-08-02 04:11 UTCVendor advisory
  52. 2026-08-02 02:27 UTCEPSS rescore
  53. 2026-08-01 14:59 UTCEG score recompute
  54. 2026-08-01 14:59 UTCVendor advisory
  55. 2026-08-01 04:16 UTCEPSS rescore
  56. 2026-07-31 07:04 UTCEG score recompute
  57. 2026-07-30 16:28 UTCEPSS rescore
  58. 2026-07-30 01:30 UTCEPSS rescore
  59. 2026-07-29 14:39 UTCEG score recompute
  60. 2026-07-28 15:36 UTCEPSS rescore
  61. 2026-07-27 14:13 UTCEPSS rescore
  62. 2026-07-27 09:56 UTCEG score recompute
  63. 2026-07-26 14:54 UTCEPSS rescore
  64. 2026-07-26 14:54 UTCEPSS rescore
  65. 2026-07-25 14:18 UTCEPSS rescore
  66. 2026-07-24 14:17 UTCEPSS rescore
  67. 2026-07-23 14:18 UTCEPSS rescore
  68. 2026-07-23 03:12 UTCEG score recompute▲ 2.80
  69. 2026-07-22 14:08 UTCEPSS rescore
  70. 2026-07-21 15:24 UTCEPSS rescore
  71. 2026-07-20 17:08 UTCEPSS rescore
  72. 2026-07-19 14:31 UTCEPSS rescore
  73. 2026-07-19 02:29 UTCEPSS rescore
  74. 2026-07-18 10:04 UTCEPSS rescore
  75. 2026-07-16 17:03 UTCEPSS rescore

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 0% probability of exploitation in the next 30 days, which ranks it in the top 77.4% of all scored CVEs.
What is the CVSS score of CVE-2026-42998?
CVE-2026-42998 has a CVSS v3 base score of 8.8 (NVD).
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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