CVE-2026-107121VulnerabilityPublished 24 Sep 2026Updated 8 Nov 2026

Bundesamt für Sicherheit in der Informationstechnik Open Source · Keycloak: Schwachstelle ermöglicht Erlangen von Administratorrechten

Affects Bundesamt für Sicherheit in der Informationstechnik Open SourceSource GCVE Database

Authoritative record:CVE-2026-107121· Medium 6.5

Not known to be exploited · CVSS 6.5 Medium · fixed in 26.8.2 : update Bundesamt für Sicherheit in der Informationstechnik Open Source when convenient.

Data as of 9 Nov 2026, 13:03 UTC

CVSS 3.1 base score

6.5Medium

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	6.5

Patch: Available – fixed in 26.8.2

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

Attack Vector: Network
Attack Complexity: High
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality: High
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: High: A successful attack depends on conditions beyond the attacker's control. That is, a successful attack cannot be accomplished at will, but requires the attacker to invest in some measurable amount of effort in preparation or execution against the vulnerable component before a successful attack can be expected. For example, a successful attack may require an attacker to: gather knowledge about the environment in which the vulnerable target/component exists; prepare the target environment to improve exploit reliability; or inject themselves into the logical network path between the target and the resource requested by the victim in order to read and/or modify network communications (e.g., a man in the middle attack).
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
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: High: There is total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact.
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 7 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 fixed version is available in Keycloak 26.8.2; upgrading to this version or later fully mitigates the vulnerability. No effective temporary mitigations meeting Red Hat's criteria are available. Users should apply the official fix promptly to prevent privilege escalation.

Description

A vulnerability in Keycloak's Fine-Grained Admin Permissions (FGAP v2) allows an attacker with limited administrative rights to escalate privileges to full realm administrator. This occurs because the system fails to recursively check permissions inside composite roles, enabling assignment of roles that include full administrative control. The issue affects versions prior to 26.8.2 and is fixed in 26.8.2.

Impact

Successful exploitation grants an attacker complete management access over the affected Keycloak realm, including the ability to read and modify sensitive data and configurations. This privilege escalation can compromise the entire identity and access management environment managed by Keycloak. The attack requires network access, high privileges initially, and no user interaction, with unchanged scope but high impact on confidentiality, integrity, and availability.

Summary

The vulnerability in Keycloak's FGAP v2 arises from improper authorization checks during role assignment. Specifically, when a delegated administrator attempts to assign a role, the system does not inspect composite roles for nested permissions. This oversight allows an attacker with limited privileges to assign a composite role that grants full administrative control over the realm, effectively escalating their privileges to full realm-admin. The flaw requires a pre-existing configuration where composite roles with privileged permissions exist. Red Hat rates this vulnerability as Important with a CVSS v3 base score of 6.6, reflecting high confidentiality, integrity, and availability impacts, but high attack complexity and privileges required.

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 9 Nov 2026, 13:03 UTC

Technical details

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