What is CVE-2026-27314?

CVE-2026-27314 is a high-severity vulnerability in Apache Cassandra, classified under Privilege Defined With Unsafe Actions. CVSS score: 8.8/10. Published 2026-04-07.

How severe is CVE-2026-27314?

High severity. CVSS v3 base score is 8.8 out of 10.

Privilege escalation in Apache Cassandra

CVE-2026-27314

Privilege escalation in Apache Cassandra 5.0 on an mTLS environment using MutualTlsAuthenticator allows a user with only CREATE permission to associate their own certificate identity with an arbitrary role, including a superuser role, and authenticate as that role via ADD IDENTITY. Users are recommended to upgrade to version 5.0.7+, which fixes this issue.

Published 2026-04-07 · last modified 2026-10-26.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.003 (18.2th percentile), scored 2026-11-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 18th percentile — 18.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: -0.001

Affected products

Apache Cassandra
Apache Software Foundation Cassandra — versions 5.0

Weakness classification (CWE)

CWE-267 — Privilege Defined With Unsafe Actions

References

lists.apache.org/thread/zrng82ddy4rpsmfyk582v6hqxcqrbz7f (vendor-advisory, Mailing List, Vendor Advisory)
af854a3a-2127-422b-91ae-364da2661108 (Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2026-27314?: CVE-2026-27314 is a high-severity vulnerability in Apache Cassandra, classified under Privilege Defined With Unsafe Actions. CVSS score: 8.8/10. Published 2026-04-07.
How severe is CVE-2026-27314?: High severity. CVSS v3 base score is 8.8 out of 10.