Cyber Resilience

CVE-2026-9802

Redhat Build Of Keycloak

Published
28 May 2026
Modified
26 June 2026
Patch / advisory
View advisory
CVSS Score v3.1 6.8
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
EPSS Score 0.0030 22th percentile
Risk Priority 42 floored blend · peak EPSS

Summary

CVE-2026-9802 is a medium-severity Insufficient Session Expiration (CWE-613) vulnerability in Redhat Build Of Keycloak. Its CVSS base score is 6.8 (Medium).

Operationally, exploitation aligns with the MITRE ATT&CK technique Web Session Cookie (T1550.004); ranked at the 22th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified map to AC-12 (Session Termination) and AC-3 (Access Enforcement) — see the control section below for these in your framework.

OWASP Top 10 for Web (2025)

A07:2025 Authentication Failures

EU & UK References

Vulnerability Data

A flaw was found in Keycloak. When revokeRefreshToken=true is enabled and persistent session storage is in use, a server restart can reset internal timing mechanisms. This allows a remote attacker, who has previously captured a user's refresh token, to replay…

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that token even after it has been revoked. Successful exploitation grants the attacker unauthorized access to the victim's account, potentially leading to information disclosure or privilege escalation.

CWE(s)
CWE-613

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1550.004 Web Session Cookie Lateral Movement
Adversaries can use stolen session cookies to authenticate to web applications and services.
attack.mitre.org →
T1078 Valid Accounts Stealth
Adversaries may obtain and abuse credentials of existing accounts as a means of gaining Initial Access, Persistence, Privilege Escalation, or Defense Evasion.
attack.mitre.org →
Why these techniques?

Vulnerability enables replay of revoked refresh tokens for unauthorized account access, directly facilitating use of alternate auth material (T1550.004) and valid accounts (T1078).

Confidence: MEDIUM · MITRE ATT&CK Enterprise v19.0

Likely ATT&CK TechniquesAI

Techniques this vulnerability likely enables, inferred from its description, weakness type, and attributed-actor tradecraft. Confidence is per-technique.

T1078 Valid Accounts Stealthconfidence: HIGH
Replay of a revoked refresh token grants the attacker access via a valid account session.
attack.mitre.org →
T1550.004 Web Session Cookie Lateral Movementconfidence: HIGH
The captured refresh token is reused as alternate authentication material to hijack the victim's session.
attack.mitre.org →
inferred from description + CWE · MITRE ATT&CK Enterprise v19.0

CVEs Like This One

CVE-2026-9705Same product: Redhat Build Of Keycloak
CVE-2026-8922Same product: Redhat Build Of Keycloak
CVE-2026-12388Same product: Redhat Build Of Keycloak
CVE-2026-4325Same product: Redhat Build Of Keycloak
CVE-2026-9799Same product: Redhat Build Of Keycloak
CVE-2026-9803Same product: Redhat Build Of Keycloak
CVE-2026-9793Same product: Redhat Build Of Keycloak
CVE-2024-7318Same product: Redhat Build Of Keycloak
CVE-2026-4628Same product: Redhat Build Of Keycloak
CVE-2026-3911Same product: Redhat Build Of Keycloak

Affected Assets

redhat
build of keycloak
all versions

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)
  • AC-12 Session Termination
  • AC-3 Access Enforcement
  • SC-23 Session Authenticity
Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)

—

Validate
Prove the fix (OWASP ASVS)

—

Mitigating Controls (NIST 800-53 r5) AI

AC-12 Session Termination good match
prevent

Directly enforces session termination so that revoked refresh tokens remain invalid even after server restarts.

AC-3 Access Enforcement good match
prevent

Ensures access decisions continue to honor token revocation state, blocking replay of revoked refresh tokens.

SC-23 Session Authenticity partial match
prevent

Protects session authenticity by binding refresh tokens to verifiable session state that survives restarts.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.AA-01 mostly match
prevents

Credential lifecycle management directly includes enforcing session expiration to prevent reuse.

PR.AA-05 mostly match
prevents

Authorization policy enforcement and review covers terminating stale sessions to limit access scope.

PR.AA-03 partial match
prevents

Authentication mechanisms can incorporate session timeout checks but do not inherently address expiration policy.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.5 Secure authentication none match
none

Automatic termination of inactive sessions and limits on connection duration shrink the window during which a hijacked or unattended authenticated session can be exploited.

References