CVE-2026-90997 (GCVE-0-2026-90997)
Vulnerability from cvelistv5 – Published: 2026-09-17 18:47 – Updated: 2026-09-17 18:56
VLAI
EPSS
VEX
Title
Keycloak: Replay protection bypass leads to unauthorized access via database driver semantics mismatch
Summary
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.
Severity
7.4 (High)
CWE
- CWE-294 - Authentication Bypass by Capture-replay
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://access.redhat.com/security/cve/cve-2026-90997 | vdb-entryx_refsource_REDHAT |
| https://github.com/keycloak/keycloak | product |
Impacted products
{
"containers": {
"cna": {
"affected": [
{
"collectionURL": "https://github.com/keycloak/keycloak",
"defaultStatus": "unaffected",
"packageName": "keycloak-services",
"product": "Keycloak",
"vendor": "Keycloak",
"versions": [
{
"lessThan": "26.7.4",
"status": "affected",
"version": "26.7.0",
"versionType": "semver"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "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\u0027s 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."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.4,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N",
"version": "3.1"
},
"format": "CVSS"
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-294",
"description": "CWE-294 Authentication Bypass by Capture-replay",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-09-17T18:56:17.887Z",
"orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
"shortName": "redhat"
},
"references": [
{
"tags": [
"vdb-entry",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/security/cve/cve-2026-90997"
},
{
"tags": [
"product"
],
"url": "https://github.com/keycloak/keycloak"
}
],
"title": "Keycloak: Replay protection bypass leads to unauthorized access via database driver semantics mismatch"
}
},
"cveMetadata": {
"assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
"assignerShortName": "redhat",
"cveId": "CVE-2026-90997",
"datePublished": "2026-09-17T18:47:34.059Z",
"dateReserved": "2026-09-14T14:53:37.815Z",
"dateUpdated": "2026-09-17T18:56:17.887Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"nvd": "{\"cve\":{\"id\":\"CVE-2026-90997\",\"sourceIdentifier\":\"secalert@redhat.com\",\"published\":\"2026-09-17T19:17:06.740\",\"lastModified\":\"2026-09-17T19:17:06.740\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"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\u0027s 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.\"}],\"affected\":[{\"source\":\"secalert@redhat.com\",\"affectedData\":[{\"vendor\":\"Keycloak\",\"product\":\"Keycloak\",\"defaultStatus\":\"unaffected\",\"collectionURL\":\"https://github.com/keycloak/keycloak\",\"packageName\":\"keycloak-services\",\"versions\":[{\"version\":\"26.7.0\",\"lessThan\":\"26.7.4\",\"versionType\":\"semver\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"secalert@redhat.com\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N\",\"baseScore\":7.4,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":2.2,\"impactScore\":5.2}]},\"weaknesses\":[{\"source\":\"secalert@redhat.com\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-294\"}]}],\"references\":[{\"url\":\"https://access.redhat.com/security/cve/cve-2026-90997\",\"source\":\"secalert@redhat.com\"},{\"url\":\"https://github.com/keycloak/keycloak\",\"source\":\"secalert@redhat.com\"}]}}",
"redhat_vex": {
"aggregate_severity": "Important",
"current_release_date": "2026-09-17T18:47:25+00:00",
"cve": "CVE-2026-90997",
"id": "CVE-2026-90997",
"initial_release_date": "2026-09-16T14:21:23+00:00",
"product_status:known_not_affected": "2",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "keycloak-services: Keycloak: Replay protection bypass leads to unauthorized access via database driver semantics mismatch",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90997.json",
"version": "3"
}
}
}
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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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