Vulnerability in Yahoo Cmak
CVE-2026-92778
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L.
EPSS exploit prediction
EPSS: 0.004 (38.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 38th percentile — 38.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
Weakness classification (CWE)
References
- github.com/yahoo/CMAK/issues/936 (issue-tracking)
- github.com/yahoo/CMAK (product)
- github.com/yahoo/CMAK/blob/3.0.0.6/app/controllers/PreferredReplicaElection.sca… (technical-description)
- www.vulncheck.com/advisories/cmak-through-3.0.0.6-feature-gate-bypass-via-html-… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-92778?
- CVE-2026-92778 is a medium-severity vulnerability in Yahoo Cmak, classified under Protection Mechanism Failure. CVSS score: 5.4/10. Published 2026-09-16.
- How severe is CVE-2026-92778?
- Medium severity. CVSS v3 base score is 5.4 out of 10.