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CVE Record

CVE-2026-4282: Keycloak: keycloak: privilege escalation via forged authorization codes due to singleuseobjectprovider isolation flaw

A flaw was found in Keycloak. The SingleUseObjectProvider, a global key-value store, lacks proper type and namespace isolation. This vulnerability allows an unauthenticated attacker to forge authorization codes. Successful exploitation can lead to the creation of admin-capable access tokens, resulting in privilege escalation.

HighCVSS 7.4Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

CVE-2026-4282 is a high-severity Keycloak flaw where weak separation inside a single-use key-value store can let an unauthenticated attacker forge authorization codes. If successful, this can produce admin-capable access tokens and escalate privileges in affected Red Hat build of Keycloak deployments.

Executive priority

Treat this as a near-term patching priority for Keycloak-backed authentication services. A successful exploit can affect privileged access, but available sources do not confirm active exploitation. Prioritize externally reachable and admin-critical environments first.

Technical view

Red Hat describes improper type and namespace isolation in Keycloak SingleUseObjectProvider. The issue can allow forged authorization codes and admin-capable token creation. CVSS 3.1 is 7.4: network reachable, high complexity, no privileges, no user interaction, with high confidentiality and integrity impact.

Likely exposure

Exposure is limited by the provided data to affected Red Hat build of Keycloak 26.2 and 26.4 package entries. Internet-facing identity providers, admin realms, and environments relying on Keycloak for privileged application access carry higher business risk.

Exploitation context

The CVE is not listed as KEV in the source bundle, and no cited source states active exploitation. The attack is unauthenticated and network-based but rated high complexity, so urgency is serious but should not be treated as confirmed mass exploitation.

Researcher notes

The root issue is CWE-653 involving isolation failure in SingleUseObjectProvider. The source bundle does not provide exploit mechanics, indicators, or non-Red Hat product impact. Version mapping is package-specific, so validation should use Red Hat advisories and CSAF data rather than product-name assumptions.

Mitigation direction

  • Apply the relevant Red Hat RHSA updates for affected Keycloak packages.
  • Prioritize Red Hat build of Keycloak 26.2 and 26.4 deployments.
  • Confirm whether fixed or unaffected builds 26.2.15 or 26.4.11 apply to your channel.
  • Restrict administrative access paths while patching is scheduled.
  • Monitor vendor guidance for package-specific remediation details.

Validation and detection

  • Inventory all Red Hat build of Keycloak deployments and package versions.
  • Compare installed packages with Red Hat affected and unaffected entries.
  • Confirm RHSA-2026:6475 through RHSA-2026:6478 applicability.
  • Review logs for unexplained admin-capable token issuance.
  • Check whether public identity endpoints expose affected deployments.
Prepared
Confidence
high
Sources
9

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · low confidence lookup

CWE-653: Exact CWE lookup

Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

Open ATT&CK lookup
description · low confidence lookup

Privilege behavior lookup

The CVE wording references privilege impact, so privilege escalation and authorization behavior review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

Open ATT&CK lookup
cve · low confidence lookup

CVE-2026-4282 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

Open ATT&CK lookup
Vulnerability profileCVE Program record
Severity
High
CVSS
7.4 (3.1)
Known Exploited
No
Published

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

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

2CVSS vectors
7Timeline events
2ADP providers
8Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: total

CVSS vector scores

2 official scores

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
7.4CVSS 3.1HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N2.25.2redhat
7.4CVSS 3.1HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N2.25.2redhat-SADP

Vulnerability scoring details

Base CVSS 3.1 score

7.4High
CVSS 3.1 vector shape for CVE-2026-4282Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. ADP timelineredhat-SADP

    Reported to Red Hat.

  3. Source timelineredhat

    Reported to Red Hat.

  4. ADP timelineredhat-SADP

    Made public.

  5. Source timelineredhat

    Made public.

  6. CVE publishedCVE Program

    The CVE record was published.

  7. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc
redhat-SADPkeycloak: Keycloak: Privilege escalation via forged authorization codes due to SingleUseObjectProvider isolation flaw
other:Red Hat severity ratingcvssV3_1
  • 2026-03-16T15:53:57.767Z: Reported to Red Hat.
  • 2026-04-02T12:30:00.000Z: Made public.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
Red HatRed Hat build of Keycloak 26.2rhbk/keycloak-operator-bundle, 26.2.15-1affected
Red HatRed Hat build of Keycloak 26.2rhbk/keycloak-rhel9, 26.2-18affected
Red HatRed Hat build of Keycloak 26.2rhbk/keycloak-rhel9-operator, 26.2-18affected
Red HatRed Hat build of Keycloak 26.2.15rhbk/keycloak-rhel9unaffected
Red HatRed Hat build of Keycloak 26.4rhbk/keycloak-operator-bundle, 26.4.11-1affected
Red HatRed Hat build of Keycloak 26.4rhbk/keycloak-rhel9, 26.4-14affected
Red HatRed Hat build of Keycloak 26.4rhbk/keycloak-rhel9-operator, 26.4-14affected
Red HatRed Hat build of Keycloak 26.4.11rhbk/keycloak-rhel9unaffected
Weakness

CWE details

CWE-653

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.