CVE-2023-24044: A Host Header Injection issue on the Login page of Plesk Obsidian through 18.0.49 allows attackers to redirect

Q: How do I fix CVE-2023-24044?

obsidian: upgrade to newer than 18.0.49. Exact commands for each OS are on this page.

Q: Is CVE-2023-24044 being exploited?

CVE-2023-24044 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2023-24044 affect?

CVE-2023-24044 affects obsidian. Severity is medium (CVSS 6.1). A Host Header Injection issue on the Login page of Plesk Obsidian through 18.0.49 allows attackers to redirect users to malicious websites via a Host request header. NOTE: the vendor's position is "the ability to use arbitrary domain names

Q: How urgent is CVE-2023-24044?

Priority 47/100. Public exploit reference

This month

MEDIUM 6.1UPGRADE

CVE-2023-24044 is a medium-severity flaw (CVSS 6.1) affecting obsidian. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A Host Header Injection issue on the Login page of Plesk Obsidian through 18.0.49 allows attackers to redirect users to malicious websites via a Host request header. NOTE: the vendor's position is "the ability to use arbitrary domain names to access the panel is an intended feature."

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	2.3% (top 17%)
CISA exploited list	No
Weakness	CWE-601
Published	2023-01-22
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: plesk

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-01-22 03:15 UTCPublished CVE record published
2026-06-17 05:38 UTCUpdated Record last modified

plesk obsidian UPGRADE

Affected: <= 18.0.49

Fixed in: newer than 18.0.49

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 18.0.49 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade obsidian

Note

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

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-2023-24044?

obsidian: upgrade to newer than 18.0.49. Exact commands for each OS are on this page.

Is CVE-2023-24044 being exploited?

CVE-2023-24044 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-2023-24044 affect?

CVE-2023-24044 affects obsidian. Severity is medium (CVSS 6.1). A Host Header Injection issue on the Login page of Plesk Obsidian through 18.0.49 allows attackers to redirect users to malicious websites via a Host request header. NOTE: the vendor's position is "the ability to use arbitrary domain names

How urgent is CVE-2023-24044?

Priority 47/100. Public exploit reference

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References

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