Security readout for executives and security teams
Plain-English summary
CVE-2026-4282 is a Keycloak flaw that can let an unauthenticated attacker forge login authorization codes. If successful, the attacker could obtain admin-capable access tokens. Because Keycloak often controls identity and application access, compromise can create broad business impact even though Red Hat rates attack complexity as high.
Executive priority
Treat this as high priority for identity platforms. It can affect administrative access and downstream applications, but available sources do not show active exploitation. Patch planning should focus first on internet-exposed, production, and privileged-realm Keycloak deployments.
Technical view
The issue is improper type and namespace isolation in Keycloak's SingleUseObjectProvider global key-value store. Red Hat says this can permit forged authorization codes and privilege escalation to admin-capable access tokens. The CVSS 3.1 score is 7.4, with network attack vector, no privileges, no user interaction, high complexity, and high confidentiality and integrity impact.
Likely exposure
Exposure appears limited to listed Red Hat build of Keycloak 26.2 and 26.4 packages and operator bundles. Source data marks Red Hat build of Keycloak 26.2.15 and 26.4.11 as unaffected, but package mapping is nuanced and should be confirmed against installed versions and RHSA advisories.
Exploitation context
The bundle does not cite active exploitation, and KEV is false. Exploitation is described as unauthenticated but high complexity. No public exploit steps are provided in the source bundle, and none should be assumed from the available evidence.
Researcher notes
Key analysis points are SingleUseObjectProvider isolation, authorization-code integrity, and token privilege outcome. The source bundle identifies CWE-653 and affected Red Hat package streams, but does not provide exploit mechanics, full patch details, or evidence of exploitation in the wild.
Mitigation direction
- Identify all Red Hat build of Keycloak 26.2 and 26.4 deployments.
- Review RHSA-2026:6475 through RHSA-2026:6478 for applicable updates.
- Upgrade to vendor-designated unaffected builds where applicable.
- Prioritize externally reachable or identity-critical Keycloak environments.
- Monitor Red Hat CVE and Bugzilla pages for revised guidance.
Validation and detection
- Inventory installed Keycloak package names and versions.
- Compare deployments with Red Hat affected and unaffected product entries.
- Confirm whether operator bundles are present and updated.
- Review identity logs for unusual admin token issuance or authorization-code anomalies.
- Verify remediation status against the relevant RHSA advisory.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
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-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 lookupPrivilege 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 lookupCVE-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- 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
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.
SSVC decision data
CVSS vector scores
2 official scoresWe 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.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N2.25.2redhatCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N2.25.2redhat-SADPVulnerability scoring details
Base CVSS 3.1 score
7.4HighVector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Base CVSS 3.1 score
7.4HighVector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- ADP timelineredhat-SADP
Reported to Red Hat.
- Source timelineredhat
Reported to Red Hat.
- ADP timelineredhat-SADP
Made public.
- Source timelineredhat
Made public.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
- 2026-03-16T15:53:57.767Z: Reported to Red Hat.
- 2026-04-02T12:30:00.000Z: Made public.
Source materials
- CVE List V5 sourceCVE List V5
- RHSA-2026:6475CVE reference, redhat · vendor-advisory, x_refsource_REDHAT
- RHSA-2026:6476CVE reference, redhat · vendor-advisory, x_refsource_REDHAT
- RHSA-2026:6477CVE reference, redhat · vendor-advisory, x_refsource_REDHAT
- RHSA-2026:6478CVE reference, redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2026-4282CVE reference, redhat · vdb-entry, x_refsource_REDHAT
- RHBZ#2448061CVE reference, redhat · issue-tracking, x_refsource_REDHAT
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4282.jsonCVE reference, redhat-SADP · x_sadp-csaf-vex
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Isolation or Compartmentalization
Improper Isolation or Compartmentalization represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.