Security readout for executives and security teams
Plain-English summary
Keycloak may accept malformed Bearer authentication headers that should be rejected. That can weaken controls relying on strict token-header parsing, creating a limited integrity risk rather than a confidentiality or availability event based on the supplied CVSS data.
Executive priority
Treat this as a moderate identity-platform issue. It does not show known exploitation or data disclosure in the bundle, but Keycloak often protects critical applications, so affected deployments should be inventoried and patched through vendor guidance.
Technical view
The flaw is overly permissive Authorization header parsing in Keycloak. Non-standard separators, including tabs, and case deviations from RFC 6750 may be accepted for the Bearer scheme. CVSS 5.3 indicates network reachability, low complexity, no privileges, no user interaction, and low integrity impact.
Likely exposure
Exposure is most likely where Red Hat build of Keycloak 26.4 packages listed as affected process bearer-token traffic. The bundle lists some 26.4 package builds as affected and Red Hat build of Keycloak 26.4.10 as unaffected.
Exploitation context
The source bundle does not identify active exploitation, and KEV is false. The likely abuse scenario is bypassing controls that depend on strict Authorization header formatting, but the sources do not describe a complete exploit chain.
Researcher notes
Evidence is limited to Red Hat and Keycloak public references in the bundle. The core issue is parser permissiveness versus RFC 6750 expectations. Avoid assuming broader upstream or downstream impact unless vendor advisories or deployment evidence confirm it.
Mitigation direction
- Check Red Hat advisories RHSA-2026:3947 and RHSA-2026:3948 for vendor-approved updates.
- Inventory Red Hat build of Keycloak 26.4 package versions against the affected list.
- Prioritize upgrade or replacement of affected rhbk Keycloak packages.
- Review gateways and custom filters that rely on strict Bearer header parsing.
- Monitor vendor guidance and the linked Keycloak issue for remediation details.
Validation and detection
- Confirm deployed Keycloak product, package name, and build version.
- Compare installed rhbk packages with the affected and unaffected entries in the CVE record.
- Review authentication logs for unusual Authorization header formatting patterns.
- Verify compensating controls do not trust malformed Bearer scheme variants.
- Track remediation status against Red Hat advisory guidance.
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-551: 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 lookupCVE-2026-0707 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
- Medium
- CVSS
- 5.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/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
1 official scoreWe 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:L/PR:N/UI:N/S:U/C:N/I:L/A:N3.91.4redhatVulnerability scoring details
Base CVSS 3.1 score
5.3MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- Source timelineredhat
Made public.
- Source timelineredhat
Reported to Red Hat.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- 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
Source materials
- CVE List V5 sourceCVE List V5
- RHSA-2026:3947CVE reference, redhat · vendor-advisory, x_refsource_REDHAT
- RHSA-2026:3948CVE reference, redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2026-0707CVE reference, redhat · vdb-entry, x_refsource_REDHAT
- RHBZ#2427768CVE reference, redhat · issue-tracking, x_refsource_REDHAT
- https://github.com/keycloak/keycloak/issues/49433CVE reference, redhat
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.
Incorrect Behavior Order: Authorization Before Parsing and Canonicalization
Incorrect Behavior Order: Authorization Before Parsing and Canonicalization represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.