Security readout for executives and security teams
Plain-English summary
CVE-2026-1190 is a low-severity Keycloak SAML brokering issue. In some SAML login flows, Keycloak may not enforce a response expiration timestamp correctly. This could make a SAML response remain valid longer than intended, causing unexpected session duration or extra resource use. It requires user interaction and has limited integrity impact.
Executive priority
Treat as routine patch management unless your identity platform heavily depends on SAML brokering. The business risk is not credential theft in the published description, but weaker session timing control and possible operational side effects. Address during normal identity platform maintenance windows.
Technical view
The flaw affects Keycloak SAML brokering when Keycloak is configured as a SAML client. Keycloak fails to validate the NotOnOrAfter value in SubjectConfirmationData. Red Hat rates it CVSS 3.1, low severity, vector AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N, mapped to CWE-112.
Likely exposure
Exposure is limited to environments using affected Red Hat Keycloak-related packages with SAML brokering/client configurations. Listed affected products include Red Hat build of Keycloak 26.4 packages, keycloak-services in JBoss EAP 8, JBoss EAP Expansion Pack, and Red Hat Single Sign-On 7.
Exploitation context
No active exploitation is indicated in the provided sources, and the CVE is not listed as KEV. Exploitation requires network access, high attack complexity, no privileges, and user interaction. The described impact is limited to response validity timing, unexpected sessions, or resource consumption.
Researcher notes
The key condition is unchecked NotOnOrAfter in SubjectConfirmationData during SAML brokering. Sources do not provide exploit details or broad exploitation evidence. Validate affectedness by product, package, version, and SAML client configuration rather than assuming all Keycloak deployments are exposed.
Mitigation direction
- Review Red Hat advisories RHSA-2026:3947 and RHSA-2026:3948 for applicable updates.
- Prioritize systems using SAML brokering where Keycloak acts as a SAML client.
- Upgrade affected Red Hat packages according to vendor guidance.
- If updates are not available, monitor vendor guidance and reduce unnecessary SAML brokering exposure.
Validation and detection
- Inventory Keycloak, Red Hat SSO, JBoss EAP, and EAP Expansion Pack deployments.
- Identify deployments using SAML brokering with Keycloak as a SAML client.
- Compare installed package versions against Red Hat CVE and errata records.
- Confirm whether Red Hat build of Keycloak 26.4.10 is marked unaffected in your environment.
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-112: 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-2026-1190 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
- Low
- CVSS
- 3.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/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.
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:H/PR:N/UI:R/S:U/C:N/I:L/A:N1.61.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
3.1LowVector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- RHSA-2026:3947CVE reference · vendor-advisory, x_refsource_REDHAT
- RHSA-2026:3948CVE reference · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2026-1190CVE reference · vdb-entry, x_refsource_REDHAT
- RHBZ#2430835CVE reference · 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.
Missing XML Validation
Missing XML Validation represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.