Staging Environment: Content and features may be unstable or change without notice.
Advisory details: github_osv / GHSA-63v5-26vq-m4vm
Advisory ID github_osv/GHSA-63v5-26vq-m4vm
Aliases CVE-2026-1190
Summary Keycloak's missing timestamp validation allows attackers to extend SAML response validity periods A flaw was found in Keycloak's SAML brokering functionality. When Keycloak is configured as a client in a Security Assertion Markup Language (SAML) setup, it fails to validate the `NotOnOrAfter` timestamp within the `SubjectConfirmationData`. This allows an attacker to delay the expiration of SAML responses, potentially extending the time a response is considered valid and leading to unexpected session durations or resource consumption.
Status Published
Exploitability 0.5
Weighted Severity 2.8
Risk 1.4
Affected and Fixed Packages Package Details
Introduced and Fixed Package Commit Patches Package Commit Patches Details
Weaknesses (3)
CWE-347 Improper Verification of Cryptographic Signature
CWE-613 Insufficient Session Expiration
CWE-112 Missing XML Validation
System Score Found at
cvssv3.1 3.1 https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/01/GHSA-63v5-26vq-m4vm/GHSA-63v5-26vq-m4vm.json
generic_textual LOW
Reference id Reference type URL
https://bugzilla.redhat.com/show_bug.cgi?id=2430835
https://github.com/keycloak/keycloak
https://github.com/keycloak/keycloak/issues/45646
CVE-2026-1190 https://access.redhat.com/security/cve/CVE-2026-1190
CVE-2026-1190 https://nvd.nist.gov/vuln/detail/CVE-2026-1190
RHSA-2026:3947 https://access.redhat.com/errata/RHSA-2026:3947
RHSA-2026:3948 https://access.redhat.com/errata/RHSA-2026:3948
No exploits are available.

No EPSS data available for this advisory.

Patch URL
There are no known patches.
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N Found at https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/01/GHSA-63v5-26vq-m4vm/GHSA-63v5-26vq-m4vm.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none

Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-01-26T20:57:42Z/

Decision: Track

Source URL: https://github.com/cisagov/vulnrichment/blob/develop/2026/1xxx/CVE-2026-1190.json

Source Advisory: vulnrichment/CVE-2026-1190

View SSVC decision tree 
[{'Exploitation': 'none'},
 {'Automatable': 'no'},
 {'Technical Impact': 'partial'},
 {'Mission Prevalence': 'minimal'},
 {'Public Well-being Impact': 'material'},
 {'Mission & Well-being': 'medium'}]