CVE-2026-15571

HIGHPre-NVD 7.37.3—
EchelonGraph scoreMEDIUM confidence

Score 7.3 from GitHub Security Advisory (severity: HIGH) published 2026-08-18. A secondary CVSS source baseline 7.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
7.3EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 7.3Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

A flaw was found in the legacy client-initiated account-linking endpoint of Keycloak, a widely used open-source identity and access management solution. The mechanism used to protect the account-linking process from unauthorized requests relies on a hash that can be predicted by a malicious OIDC client. By tricking a user into authenticating, an attacker-controlled client can forge a valid linking URL to connect the victim's account to an attacker's external identity. This results in a full account takeover, allowing the attacker to log in as the victim.

CVSS v3
7.3
EG Score
7.3HIGHmedium confidence
EG Risk
33
EG Risk 33/100CISA SSVC

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
Severity73% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.4%
EPSS %ILE
35th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 18, 2026

Last Modified

August 20, 2026

Advisory Details (3)

Auto-updated Aug 18, 2026
Patch available. Sources: redhat.
redhat

2499591 – (CVE-2026-15571) CVE-2026-15571 keycloak-services: keycloak-services: Predictable account-linking hash enables account takeover via malicious OIDC client

https://bugzilla.redhat.com/show_bug.cgi?id=2499591
redhat Patch Available

CVE-2026-15571 - Red Hat Customer Portal

Affected: Red Hat Enterprise Linux 8 or OpenShift Container Platform 4, is affected by this vulnerability and a fix may be released to a

https://access.redhat.com/security/cve/CVE-2026-15571
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:56523

Vendor Advisories for CVE-2026-15571(3)

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

Patch Availability(2)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatrhbk/keycloak-rhel9-operator:26.6-122026-08-18redhat
redhatrhbk-openshift-rhel9/rhbk-openshift-rhel92026-08-18redhat

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.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 34× in last 7d / 150× 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 266 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-15571?
CVE-2026-15571 is a high vulnerability published on August 18, 2026. A flaw was found in the legacy client-initiated account-linking endpoint of Keycloak, a widely used open-source identity and access management solution. The mechanism used to protect the account-linking process from unauthorized requests relies on a hash that can be predicted by a malicious OIDC…
When was CVE-2026-15571 disclosed?
CVE-2026-15571 was first published on August 18, 2026, with the most recent update on August 20, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-15571 actively exploited?
CVE-2026-15571 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (35th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-15571?
CVE-2026-15571 has a CVSS base score of 7.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-15571?
A fix for CVE-2026-15571 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-15571 are linked in the Vendor Advisories panel on this page.

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