How severe is CVE-2026-19611?

CVE-2026-19611 has a CVSS 3.x base score of 7.4, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2026-19611 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-19611?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2026-19611 published?

CVE-2026-19611 was published on 2026-08-20 and last updated on 2026-08-21.

CVE-2026-19611

CVE-2026-19611 is a high-severity vulnerability with a CVSS 3.x base score of 7.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-173.

Key facts

Severity: High (CVSS 3.x base score 7.4)
EPSS exploit prediction: 0% (28th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-173
Published: 2026-08-20
Last modified: 2026-08-21

Description

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.

Frequently asked questions

What is CVE-2026-19611?: 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.
How severe is CVE-2026-19611?: CVE-2026-19611 has a CVSS 3.x base score of 7.4, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2026-19611 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-19611?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2026-19611 published?: CVE-2026-19611 was published on 2026-08-20 and last updated on 2026-08-21.

References

Other CWE-173 vulnerabilities

CVE-2026-10050 — Critical (CVSS 9.1): In Eclipse Jetty, the Digest authentication server-side component uses ISO-8859-1 to encode the password as…
CVE-2023-26303 — Low (CVSS 3.3): Denial of service could be caused to markdown-it-py, before v2.2.0, if an attacker was allowed to force null assertions…
CVE-2023-26302 — Low (CVSS 3.3): Denial of service could be caused to the command line interface of markdown-it-py, before v2.2.0, if an attacker was…

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