Auth bypass in Fission
CVE-2026-49821
Fission is an open-source, Kubernetes-native serverless framework that simplifies the deployment of functions and applications on Kubernetes. Prior to version 1.24.0, Fission's buildermgr controller processed Package CRDs without verifying that Package.spec.environment.namespace matched Package.metadata.namespace. This issue has been patched in version 1.24.0.
EPSS: 0.002 (14.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.7 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N.
Affected products
- Fission — versions < 1.24.0
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_CONFIRM)
Frequently asked questions
- What is CVE-2026-49821?
- CVE-2026-49821 is a high-severity vulnerability in Fission, classified under Unintended Proxy or Intermediary (Confused Deputy). CVSS score: 7.7/10. Published 2026-06-10.
- How severe is CVE-2026-49821?
- High severity. CVSS v3 base score is 7.7 out of 10.