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.

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…

EPSS: 0.002 (14.1th 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.