Security readout for executives and security teams
Plain-English summary
This Keycloak issue lets an unauthenticated remote user learn limited client configuration details from error messages on the SAML ECP endpoint. It is not described as account takeover or data theft, but it can help map identity infrastructure. Red Hat rates it Medium with CVSS 5.3.
Executive priority
Treat as a scheduled but prompt identity-platform patching item. The issue is medium severity and information disclosure only, but Keycloak is authentication infrastructure, so unnecessary exposure should be reduced and affected builds updated.
Technical view
CVE-2026-9794 is CWE-209 information disclosure in Red Hat build of Keycloak. Specially crafted SOAP requests to the SAML ECP endpoint with varying client IDs can produce distinct faultstrings that reveal a client protocol type. The CVSS vector is AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
Likely exposure
Organizations using Red Hat build of Keycloak 26.4 or 26.6 packages listed as affected, especially deployments exposing SAML ECP endpoints to untrusted networks.
Exploitation context
The source states remote, unauthenticated exploitation is possible. KEV is false, and the provided sources do not state active exploitation, public exploit availability, or observed attacks.
Researcher notes
Evidence is limited to the CVE description and Red Hat references. The disclosure channel is faultstring differentiation, not direct credential exposure. Do not assume broader Keycloak versions, exploit maturity, or exact fixed package numbers beyond the supplied affected and unaffected entries.
Mitigation direction
- Review RHSA-2026:25097, RHSA-2026:25098, RHSA-2026:30049, and RHSA-2026:30050.
- Upgrade affected Red Hat build of Keycloak packages according to Red Hat guidance.
- Confirm whether your deployed version is listed as affected or unaffected.
- Restrict unnecessary external access to SAML ECP endpoints where operationally feasible.
- Monitor Red Hat CVE and Bugzilla entries for updated remediation details.
Validation and detection
- Inventory Red Hat build of Keycloak 26.4 and 26.6 deployments.
- Check installed package names and versions against the affected list.
- Confirm whether SAML ECP endpoints are enabled and externally reachable.
- After updating, verify package versions align with Red Hat’s unaffected guidance.
- Review logs for unusual unauthenticated SAML ECP fault activity.
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-209: Information exposure and cloud metadata lookup
Information exposure and SSRF weaknesses can make discovery, cloud metadata, and credential material review relevant. 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-2026-9794 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:L/I:N/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:L/I:N/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:L/I:N/A:N
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- Source timelineredhat
Reported to Red Hat.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- 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
Source materials
- CVE List V5 sourceCVE List V5
- RHSA-2026:25097CVE reference, redhat · vendor-advisory, x_refsource_REDHAT
- RHSA-2026:25098CVE reference, redhat · vendor-advisory, x_refsource_REDHAT
- RHSA-2026:30049CVE reference, redhat · vendor-advisory, x_refsource_REDHAT
- RHSA-2026:30050CVE reference, redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2026-9794CVE reference, redhat · vdb-entry, x_refsource_REDHAT
- RHBZ#2482461CVE reference, redhat · issue-tracking, x_refsource_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.
Generation of Error Message Containing Sensitive Information
Generation of Error Message Containing Sensitive Information represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.