CVE-2026-55748: OpenStack Horizon before 25.7.4 produces scripts for OpenStack RC file downloading that may have a crafted pro

Routine

MEDIUM 6.0UPGRADE

CVE-2026-55748 is a medium-severity flaw (CVSS 6.0) affecting horizon. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

OpenStack Horizon before 25.7.4 produces scripts for OpenStack RC file downloading that may have a crafted project name with shell metacharacters. NOTE: some parties consider this a security hardening opportunity to address certain types of user error, not a vulnerability.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.0 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	High
User interaction	Required
EPSS exploit chance	0.3% (top 84%)
CISA exploited list	No
Weakness	CWE-78
Published	2026-06-17
Last modified	2026-10-26

Publisher (CNA): MITRE · Vendor: openstack

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

Am I affected?

Timeline

2026-06-17 15:17 UTCPublished CVE record published
2026-10-26 11:10 UTCUpdated Record last modified

openstack horizon UPGRADE

Affected: >= 8.0.0 and < 25.3.3 · >= 25.4.0 and < 25.5.3 · >= 25.6.0 and < 25.7.4

Fixed in: 25.3.3, 25.5.3, 25.7.4

Safe to downgrade to: a release before 8.0.0

1. Check installed version

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

2. UPGRADE to 25.3.3 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade horizon

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 8.0.0 (Debian / Ubuntu)

apt-cache madison horizon sudo apt install horizon=<VERSION_BEFORE_8.0.0> sudo apt-mark hold horizon

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

dnf --showduplicates list horizon sudo dnf downgrade horizon-<VERSION_BEFORE_8.0.0> sudo dnf versionlock add horizon

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-2026-55748?

horizon: upgrade to 25.3.3, 25.5.3, 25.7.4. Exact commands for each OS are on this page.

Is CVE-2026-55748 being exploited?

CVE-2026-55748 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-2026-55748 affect?

CVE-2026-55748 affects horizon. Severity is medium (CVSS 6.0). OpenStack Horizon before 25.7.4 produces scripts for OpenStack RC file downloading that may have a crafted project name with shell metacharacters. NOTE: some parties consider this a security hardening opportunity to address certain types of

How urgent is CVE-2026-55748?

Priority 25/100. No elevated risk signals yet.

Software pages

OpenStack vulnerabilities

References

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