CVE-2026-105305VulnerabilityPublished 5 Oct 2026Updated 8 Nov 2026

Bundesamt für Sicherheit in der Informationstechnik Open Source · Keycloak: Schwachstelle ermöglicht Umgehen von Sicherheitsvorkehrungen

Affects Bundesamt für Sicherheit in der Informationstechnik Open SourceSource GCVE Database

Authoritative record:CVE-2026-105305· Medium 5.4

Not known to be exploited · CVSS 5.4 Medium · fixed in 26.8.2 : update Bundesamt für Sicherheit in der Informationstechnik Open Source when convenient.

Data as of 9 Nov 2026, 13:02 UTC

CVSS 3.1 base score

5.4Medium

How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none

CVSS scores by source
CNA (redhat)	CVSS 3.1	5.4

Patch: Available – fixed in 26.8.2

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

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

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: Low: The attacker is authorized with (i.e., requires) privileges that provide basic user capabilities that could normally affect only settings and files owned by a user. Alternatively, an attacker with Low privileges may have the ability to cause an impact only to non-sensitive resources.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: Low: There is some loss of confidentiality. Access to some restricted information is obtained, but the attacker does not have control over what information is obtained, or the amount or kind of loss is limited. The information disclosure does not cause a direct, serious loss to the impacted component.
Integrity: Low: Modification of data is possible, but the attacker does not have control over the consequence of a modification, or the amount of modification is limited. The data modification does not have a direct, serious impact on the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 6 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 9 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

bundesamt-f-r-sicherheit-in-de

What to do

Affected software

Product	Affected	Fixed in
Red Hat build of Keycloak 26.6rhbk/keycloak-operator-bundle	Affected–	Fixed in–
Red Hat build of Keycloak 26.6rhbk/keycloak-rhel9	Affected–	Fixed in–
Red Hat build of Keycloak 26.6rhbk/keycloak-rhel9-operator	Affected–	Fixed in–
Red Hat build of Keycloak 26.6.8keycloak-services	Affected–	Fixed in–
Red Hat build of Keycloak 26.6.8rhbk/keycloak-rhel9	Affected–	Fixed in–
Red Hat Single Sign-On 7keycloak-services	Affected–	Fixed in–

AI-suggested

A fix is available in Keycloak version 26.8.2. Users should upgrade to this version or later to remediate the vulnerability. No effective workaround or temporary mitigation meeting Red Hat's criteria is currently available.

Description

A vulnerability in Keycloak's OpenID Connect Device Authorization Grant flow allows bypassing multi-factor authentication (MFA) requirements. This flaw occurs because the flow does not enforce the minimum authentication level configured per client. An attacker with a stolen user's password can exploit this to gain unauthorized access to the Keycloak Admin REST API with the client's scoped roles. The issue is fixed in version 26.8.2.

Impact

Successful exploitation allows an attacker with a stolen password to bypass MFA protections and gain unauthorized access to the Keycloak Admin REST API. This access is scoped to the client's roles, potentially exposing administrative functions and sensitive data. The confidentiality and integrity of the system are impacted, but availability is not affected.

Summary

CVE-2026-105305 is a vulnerability in Keycloak's OIDC Device Authorization Grant flow. The flaw arises from the failure to check the minimum authentication level (minimum.acr.value) required by client configuration during the device authorization process. This allows an attacker who has obtained a user's primary credentials (password) to bypass mandatory multi-factor authentication and obtain a valid token. With this token, the attacker can access the Keycloak Admin REST API with the privileges assigned to the client. The vulnerability is rated as Important by Red Hat and is fixed in Keycloak version 26.8.2.

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 9 Nov 2026, 13:02 UTC

Technical details

References

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