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Highest advisory severityMedium 2 vendors · 2 advisories

CVE-2026-115644

Authentication bypass via separate admin listener

CVE-2026-115644: Authentication bypass via separate admin listener. Not in the CISA KEV catalog. Medium advisory severity (CVSS 5.6, Red Hat).

Compare the source-linked records below. Ratings and product/version details belong to each advisory; they are not a single CVE-wide score or proof that every listed product is affected. How VulniPulse collects and checks evidence.

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CVE-2026-115644 key facts

CISA KEV
Not listed (catalog checked )
Highest advisory severity
Medium
CVSS base score
5.6 (Red Hat)
Fixed releases
  • Apache: 4.2.2, 4.3.2
Vendor advisories
2 from Apache, Red Hat
VulniPulse record
Published · Updated

Scores, vectors, weaknesses and fixed releases are quoted from vendor advisories that cover only CVE-2026-115644; bulletin-wide values are not repeated here.

Is CVE-2026-115644 exploited?

No exploitation is reported in the sources VulniPulse tracks: CVE-2026-115644 is not in the CISA KEV catalog (checked ) and no tracked advisory for it reports exploitation. That is not proof the vulnerability cannot be exploited.

How do I fix CVE-2026-115644?

Upgrade to a fixed release named by the vendor:

  • Apache: 4.2.2, 4.3.2
  • Mitigation: Users who cannot upgrade immediately can remove the admin.listeners configuration (or leave it unset). (Apache)
  • Resolution: From Apache Kafka 4.2.2, 4.3.2, and 4.4.0, we make sure the REST extensions specified via "rest.extension.classes" will also apply to "admin.listeners". (Apache)
  • To mitigate this vulnerability, remove or comment out the `admin.listeners` property in the Kafka Connect worker configuration file (`connect-distributed.properties` or `connect-standalone.properties`). When `admin.listeners` is unset, administrative endpoints share the primary listener interface and inherit its configured security extensions: ```properties # admin.listeners= ``` Alternatively, restrict network reachability to the administrative listener port using host firewall rules (such as `firewalld`) or network access controls so that only trusted management networks can access it: ```bash firewall-cmd --permanent --zone=internal --add-port= /tcp firewall-cmd --reload ``` Caveats: Unsetting the separate administrative listener consolidates administrative endpoints onto the primary listener address and port. Applying worker configuration changes requires restarting Kafka Connect services (`systemctl restart ...`), which will temporarily interrupt connector execution and data processing. (Red Hat)

Vendor advisory comparison

Apache

1 advisory
  • Advisory severityUnrated

    Advisory [CVE-2026-115644] Apache Kafka Connect contains an authentication bypass vulnerability affecting the admin REST API when admin.listeners is configured with a separate listener from the main listeners property

    CVE-2026-115644Source published Source updated

    Apache Kafka Connect contains an authentication bypass vulnerability affecting the admin REST API when admin.listeners is configured with a separate listener from the main listeners property. When operators isolate the admin REST API by explicitly configuring the "admin.listeners" property, REST extensions specified via rest.extension.classes (such as BasicAuthSecurityRestExtension) are not registered or applied to the admin resource configuration. While the primary REST API listener (configured via listeners) enforces configured authentication and authorization filters, endpoints mounted under the separate admin listener (/admin/loggers) fail to inherit or instantiate these extension filters. As a result, the admin logger endpoint accepts unauthenticated read and write requests even…

    Related products — impact not confirmed
    • Apache Kafka Connect
    Source-reported affected versions
    • Apache Kafka 2.4.0 before 4.2.2
    • Apache Kafka 4.3.0 before 4.3.2
    Source-reported fixed versions
    • 4.2.2
    • 4.3.2
    Mitigation guidance
    • Mitigation: Users who cannot upgrade immediately can remove the admin.listeners configuration (or leave it unset).
    • Resolution: From Apache Kafka 4.2.2, 4.3.2, and 4.4.0, we make sure the REST extensions specified via "rest.extension.classes" will also apply to "admin.listeners".
    Full advisory and evidenceOpen source bulletin

Red Hat

1 advisory
  • Advisory severityMedium5.6

    Medium [CVE-2026-115644] Authentication bypass via separate admin listener

    CVE-2026-115644Source published Source updated

    Apache Kafka Connect contains an authentication bypass vulnerability affecting the admin REST API when admin.listeners is configured with a separate listener from the main listeners property. When operators isolate the admin REST API by explicitly configuring the "admin.listeners" property, REST extensions specified via rest.extension.classes (such as BasicAuthSecurityRestExtension) are not registered or applied to the admin resource configuration. While the primary REST API listener (configured via listeners) enforces configured authentication and authorization filters, endpoints mounted under the separate admin listener (/admin/loggers) fail to inherit or instantiate these extension filters. As a result, the admin logger endpoint accepts unauthenticated read and write requests even…

    Affected products in this advisory
    • Red Hat build of Debezium 3
    • Red Hat Fuse 7
    • streams for Apache Kafka 3
    Source-reported affected versions
    Affected-version details not available in this record.
    Source-reported fixed versions
    No fixed-version detail extracted. This does not mean no fix exists.
    Mitigation guidance
    • To mitigate this vulnerability, remove or comment out the `admin.listeners` property in the Kafka Connect worker configuration file (`connect-distributed.properties` or `connect-standalone.properties`). When `admin.listeners` is unset, administrative endpoints share the primary listener interface and inherit its configured security extensions: ```properties # admin.listeners=http://localhost:8083 ``` Alternatively, restrict network reachability to the administrative listener port using host firewall rules (such as `firewalld`) or network access controls so that only trusted management networks can access it: ```bash firewall-cmd --permanent --zone=internal --add-port=<ADMIN_PORT>/tcp firewall-cmd --reload ``` Caveats: Unsetting the separate administrative listener consolidates administrative endpoints onto the primary listener address and port. Applying worker configuration changes requires restarting Kafka Connect services (`systemctl restart ...`), which will temporarily interrupt connector execution and data processing.
    Full advisory and evidenceOpen source bulletin

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