CVE-2026-27314: Privilege escalation in Apache Cassandra 5.0 on an mTLS environment using MutualTlsAuthenticator allows a user

This month

HIGH 8.8WATCHLISTUPGRADE

CVE-2026-27314 is a high-severity flaw (CVSS 8.8) affecting cassandra. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 82%)
CISA exploited list	No
Weakness	CWE-267
Published	2026-04-07
Last modified	2026-10-26

Publisher (CNA): Apache Software Foundation · Vendor: apache

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-07 17:16 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

apache cassandra UPGRADE

Affected: >= 5.0.0 and < 5.0.7

Fixed in: 5.0.7

Safe to downgrade to: a release before 5.0.0

1. Check installed version

apt-cache policy cassandra || rpm -q cassandra || cassandra --version

2. UPGRADE to 5.0.7 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade cassandra

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade cassandra

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 5.0.0 (Debian / Ubuntu)

apt-cache madison cassandra sudo apt install cassandra=<VERSION_BEFORE_5.0.0> sudo apt-mark hold cassandra

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list cassandra sudo dnf downgrade cassandra-<VERSION_BEFORE_5.0.0> sudo dnf versionlock add cassandra

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-27314?

cassandra: upgrade to 5.0.7. Exact commands for each OS are on this page.

Is CVE-2026-27314 being exploited?

CVE-2026-27314 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-27314 affect?

CVE-2026-27314 affects cassandra. Severity is high (CVSS 8.8). 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 a

How urgent is CVE-2026-27314?

Priority 40/100. High severity; On your watchlist

Software pages

Apache Cassandra vulnerabilities

Related CVEs

CVE-2026-27315 MEDIUM 5.5 UPGRADE Sensitive Information Leak in cqlsh in Apache Cassandra 4.0 allows access to sensitive information, like passw
CVE-2026-32588 MEDIUM 6.5 UPGRADE Authenticated DoS over CQL in Apache Cassandra 4.0, 4.1, 5.0 allows authenticated user to raise query latencie

References

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