Is CVE-2026-16103 in the CISA KEV catalog?

No. CVE-2026-16103 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-16103?

CVE-2026-16103 has a CVSS v3 base score of 4.3 (MEDIUM).

What is the EPSS score for CVE-2026-16103?

CVE-2026-16103 has an EPSS score of 0.21% (11th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix or mitigate CVE-2026-16103?

No published fix for CVE-2026-16103 has been found yet. Check the linked vendor advisories for guidance as it becomes available.

CVE & CISA-KEV Catalog

CVE-2026-16103

MEDIUM

4.3

CVSS v3

NVD

Description

A flaw was found in the keycloak-services component of Keycloak. This issue is an incomplete fix for CVE-2026-9798, where brute-force protection checks were added to the Client-Initiated Backchannel Authentication (CIBA) initiation handler but were omitted from the token redemption handler. This allows an attacker with valid client credentials to obtain access and refresh tokens for a user account that has been locked due to brute-force protection, provided the authentication request was started before the lockout occurred and was approved by the user.

CWE-841

How to fix

No published remediation has been found for this vulnerability's affected products yet.

Mitigation guidance may be in the linked vendor advisories in the References section below.

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CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityNone

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

Exploit Intelligence

0.21%probability of exploitation in 30 days

11thpercentile

Low risk: more likely to be exploited than 11% of all known CVEs.

References

Other references2

Related Vulnerabilities

Other CWE-841 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2022-1667	High	7.5	1.2%	-	Fix
CVE-2022-2105	Critical	9.4	1.0%	-	Fix
CVE-2023-4181	Medium	5.4	1.0%	-	-
CVE-2022-2102	Critical	9.4	0.9%	-	Fix
CVE-2024-51738	High	8.1	0.6%	-	Fix
CVE-2024-37296	Medium	5.3	0.5%	-	-

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-07-21.