CVE-2026-110952: Apache Kafka: Broker does not enforce JWT issuer and audience validation for SASL/OAUTHBEARER by default

Reported by oss-security

Summary by Cyber Security News28 Oct 2026, 18:25 CET

About this summary. This is a short excerpt from the description that oss-security published with its article. Cyber Security News did not report or verify the underlying story. Read the original: https://seclists.org/oss-sec/2026/q4/415

Posted by Manikumar on Oct 28 Severity: moderate Affected versions: - Apache Kafka 3.1.0 before 4.4.0 Description: A Kafka broker that authenticates clients with SASL/OAUTHBEARER using the bundled JWKS-backed validator always verifies the JWT signature, but two further checks are only performed when explicitly configured: - The issuer (iss) claim is verified only when sasl.oauthbearer.expected.issuer is set. When it is unset, a validly-signed token carrying the expected...

Read the full article at oss-security →

Source attribution: headline and facts are from oss-security (seclists.org). Summary method: excerpt of the source description. See our source attribution policy.

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