CVE-2026-15571

HIGHPre-NVD 7.37.3—
EchelonGraph scoreHIGH 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 — Patch released 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%CVSS: 7.3Exploit: None knownExposed: 0

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
7.3(high)
EG Risk
33(Track)
EG Risk 33/100SSVC: 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
Severity73% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
24%
KEV
Not listed

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 / EcosystemFixed in / 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 28× in last 7d / 28× 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 03:19 UTCEG score recompute
  2. 2026-08-21 03:19 UTCVendor advisory
  3. 2026-08-21 03:19 UTCGHSA enrichment
  4. 2026-08-20 22:55 UTCEPSS rescore
  5. 2026-08-20 15:29 UTCEG score recompute
  6. 2026-08-20 15:29 UTCVendor advisory
  7. 2026-08-20 15:29 UTCGHSA enrichment
  8. 2026-08-20 14:27 UTCEG score recompute
  9. 2026-08-20 14:27 UTCVendor advisory
  10. 2026-08-20 14:27 UTCGHSA enrichment
  11. 2026-08-20 13:56 UTCVendor advisory
  12. 2026-08-20 13:56 UTCGHSA enrichment
  13. 2026-08-20 03:14 UTCEG score recompute
  14. 2026-08-20 03:14 UTCVendor advisory
  15. 2026-08-20 03:13 UTCGHSA enrichment
  16. 2026-08-19 17:03 UTCEPSS rescore
  17. 2026-08-19 15:19 UTCVendor advisory
  18. 2026-08-19 15:19 UTCGHSA enrichment
  19. 2026-08-19 03:20 UTCEG score recompute
  20. 2026-08-19 03:20 UTCVendor advisory
  21. 2026-08-19 03:20 UTCGHSA enrichment
  22. 2026-08-19 02:18 UTCEG score recompute
  23. 2026-08-19 02:18 UTCVendor advisory
  24. 2026-08-19 02:18 UTCGHSA enrichment
  25. 2026-08-18 21:36 UTCEG score recompute
Show 3 more
  1. 2026-08-18 21:36 UTCGHSA enrichment
  2. 2026-08-18 20:43 UTCEG score recompute
  3. 2026-08-18 20:43 UTCMITRE cvelistV5first tracked

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 in the National Vulnerability Database 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% probability of exploitation in the next 30 days, which ranks it in the top 76.3% of all scored CVEs.
What is the CVSS score of CVE-2026-15571?
CVE-2026-15571 has a CVSS v3 base score of 7.3 (NVD).
How do I remediate CVE-2026-15571?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-15571, 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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