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Severity by source

Vendor (redhat) PRIMARY
7.4 HIGH
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
vuln.today AI
7.4 HIGH

AV:N because auth endpoints are network-exposed; AC:H because attacker must identify accounts with fullwidth passwords and map them; PR:N as no prior auth is required; C:H/I:H for full account takeover; A:N as no availability impact.

3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
4.0 AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Red Hat
7.4 MEDIUM
qualitative

Primary rating from Vendor (redhat).

CVSS VectorVendor: redhat

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

Lifecycle Timeline

2
Analysis Generated
Aug 20, 2026 - 16:32 vuln.today
CVE Published
Aug 20, 2026 - 15:58 nvd
HIGH 7.4

DescriptionCVE.org

A flaw was found in WildFly Elytron. Password hashing and verification normalize input with Unicode NFKC, which can collapse fullwidth characters to ASCII equivalents. A remote attacker can more easily guess affected passwords by using an ASCII-only dictionary against accounts whose passwords were intended to include those non-ASCII characters, leading to unauthorized access.

AnalysisAI

WildFly Elytron's password hashing and verification subsystem silently normalizes Unicode input via NFKC before hashing, collapsing fullwidth characters (e.g., U+FF21 'A') to their ASCII equivalents (e.g., 'A'). This allows an unauthenticated remote attacker to authenticate against accounts whose owners believed their passwords contained unique non-ASCII characters by submitting a standard ASCII-only dictionary - the normalization makes the stored hash indistinguishable from its ASCII equivalent. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Recon
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Delivery
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Exploit
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Install
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C2
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Execute
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Impact
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Vulnerability AssessmentAI

Exploitation The victim account's password must have been set using one or more fullwidth Unicode characters (Unicode block U+FF01-U+FF60, Halfwidth and Fullwidth Forms), which are canonically mapped to ASCII by NFKC normalization. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 3.1 vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N scores 7.4 (High). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Consult the Red Hat security advisory at https://access.redhat.com/security/cve/CVE-2026-19611 and Red Hat Bugzilla BZ#2514568 for patched package versions across each affected product stream; no specific fixed version number was confirmed in the provided data, so citing one would be speculative. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours, identify all systems running Red Hat JBoss EAP 7, JBoss EAP 8, Red Hat Build of Keycloak, Red Hat Data Grid 8, or other Red Hat middleware products that use Elytron, documenting their criticality and network exposure. …

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Vendor StatusVendor

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EUVD-2026-63478 vulnerability details – vuln.today

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