CVE-2026-11800 (GCVE-0-2026-11800)
Vulnerability from cvelistv5 – Published: 2026-06-25 20:57 – Updated: 2026-06-30 12:06
VLAI?
Title
Org.keycloak:keycloak-services: keycloak: authentication bypass via jwt algorithm confusion
Summary
A flaw was found in Keycloak. This JWT algorithm confusion vulnerability in the JWT Authorization Grant flow allows an attacker with valid client credentials to bypass signature verification. By forging an assertion, the attacker can create unauthorized access tokens. This enables the attacker to impersonate any federated user linked to the affected Identity Provider, leading to unauthorized access and potential privilege escalation.
Severity ?
8.1 (High)
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
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Impacted products
| Vendor | Product | Version | ||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Red Hat | Red Hat build of Keycloak 26.6 |
Unaffected:
26.6.4-2 , < *
(rpm)
cpe:/a:redhat:build_keycloak:26.6::el9 |
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Credits
Red Hat would like to thank Bilal Teke for reporting this issue.
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"cveMetadata": "{\"cveId\": \"CVE-2026-11800\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-06-30T02:42:33.589Z\", \"dateReserved\": \"2026-06-09T14:06:04.695Z\", \"assignerOrgId\": \"53f830b8-0a3f-465b-8143-3b8a9948e749\", \"datePublished\": \"2026-06-25T20:57:05.276Z\", \"assignerShortName\": \"redhat\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Sightings
| Author | Source | Type | Date |
|---|
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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