CVE-2026-92778: CMAK through 3.0.0.6 Feature Gate Bypass via HTML Form Routes

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-16 · updated 2026-09-23
Weakness: CWE-693

Description

CMAK through 3.0.0.6 fails to apply the scheduled leader election feature toggle to HTML form routes, allowing attackers to bypass the feature gate. Attackers can access the form endpoints to start and stop the recurring election scheduler, disrupting leadership across managed Kafka clusters.

Affected products

yahoo CMAK: through 3.0.0.6

References

https://github.com/yahoo/CMAK
https://github.com/yahoo/CMAK/blob/3.0.0.6/app/controllers/PreferredReplicaElection.scala#L110-L143
https://github.com/yahoo/CMAK/issues/936
https://www.vulncheck.com/advisories/cmak-through-3.0.0.6-feature-gate-bypass-via-html-form-routes

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