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Back to active CVEs
High · CVSS 7.4CVE-2026-90997

Keycloak-services: keycloak: replay protection bypass leads to unauthorized access via database driver semantics mismatchCVE-2026-90997

Answer in brief

CVE-2026-90997 records a High severity (CVSS 7.4) vulnerability in Keycloak-services: keycloak: replay protection bypass leads to unauthorized access via database driver semantics mismatch. The current sources do not mark it as known exploited. The current feed maps Keycloak/Keycloak (generic), Keycloak/keycloak-services (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 17, 2026Updated Sep 25, 2026Source checked Nov 1, 2026First seen by HOL Sep 17, 2026Material review Sep 25, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 7.4
Exploitation
Not marked as known exploited
Affected software
2 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 7.4. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Keycloak/Keycloak (generic), Keycloak/keycloak-services (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Keycloak/Keycloakgeneric>=26.7.0 <26.7.426.7.4
Keycloak/keycloak-servicesgeneric>=26.7.0 <26.7.426.7.4

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Keycloak/Keycloak, Keycloak/keycloak-services.
  2. 2Review the reported fix. Source-reported workaround: To mitigate this issue, configure the JDBC connection string for MySQL/MariaDB to explicitly set `useAffectedRows=true`. This ensures the database driver correctly reports affected rows, preventing the replay protection bypass. This mitigation is applicable only when Keycloak is deployed in stateless mode and utilizes MySQL or MariaDB as its database. A restart of the Keycloak service will be required for the configuration change to take effect.

Evidence timeline and material changes

  1. Published upstream

    Sep 17, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Sep 25, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Sep 17, 2026

Sources and claim methodology

  • Source referenceaccess.redhat.com
  • Source referencebugzilla.redhat.com
  • Source referenceaccess.redhat.com
  • GitHub security advisorygithub.com
Upstream source description

A flaw was found in Keycloak. When deployed in stateless mode with MySQL or MariaDB, a mismatch in row-count semantics between the database driver and Keycloak's application logic allows an attacker to bypass replay protection. This vulnerability enables an attacker who intercepts single-use security artifacts, such as JWT client assertions, DPoP proofs, or one-time password (TOTP) codes, to replay them. Successful exploitation grants unauthorized access to the token endpoint or login flow.

Quoted source text, attributed separately from HOL analysis.

Record context

Vulnerability class
Secret Exfiltration
EPSS
Not reported
CWE IDs
CWE-294
Source
CVE List V5
Source checked
Nov 1, 2026
References
4 linked sources
Open source record